diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/CoalesceToTernaryRectorTest.php b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/CoalesceToTernaryRectorTest.php
deleted file mode 100644
index 794029d9f2d..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/CoalesceToTernaryRectorTest.php
+++ /dev/null
@@ -1,28 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector;
-
-use Iterator;
-use PHPUnit\Framework\Attributes\DataProvider;
-use Rector\Testing\PHPUnit\AbstractRectorTestCase;
-
-final class CoalesceToTernaryRectorTest extends AbstractRectorTestCase
-{
-    #[DataProvider('provideData')]
-    public function test(string $filePath): void
-    {
-        $this->doTestFile($filePath);
-    }
-
-    public static function provideData(): Iterator
-    {
-        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
-    }
-
-    public function provideConfigFilePath(): string
-    {
-        return __DIR__ . '/config/configured_rule.php';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/non_nullable_left.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/non_nullable_left.php.inc
deleted file mode 100644
index 5c094d481ec..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/non_nullable_left.php.inc
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class NonNullableLeft
-{
-    public function run(string $name)
-    {
-        return $name ?? 'tom';
-    }
-}
-
-?>
------
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class NonNullableLeft
-{
-    public function run(string $name)
-    {
-        return $name ?: 'tom';
-    }
-}
-
-?>
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_array_dim_fetch.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_array_dim_fetch.php.inc
deleted file mode 100644
index 0eb5a0df2f0..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_array_dim_fetch.php.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-final class SkipArrayDimFetch
-{
-    public function run(array $data)
-    {
-        return $data['key'] ?? 'test';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_docblock_based.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_docblock_based.php.inc
deleted file mode 100644
index 16d63b2ef15..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_docblock_based.php.inc
+++ /dev/null
@@ -1,14 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipDocblockBased
-{
-    /**
-     * @param string $name
-     */
-    public function run($name)
-    {
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_mixed_type.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_mixed_type.php.inc
deleted file mode 100644
index 4dd0a9f5715..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_mixed_type.php.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipMixedType
-{
-    public function run(mixed $name)
-    {
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_not_defined.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_not_defined.php.inc
deleted file mode 100644
index a3dce46ae26..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_not_defined.php.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipNotDefined
-{
-    public function run()
-    {
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_null_type.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_null_type.php.inc
deleted file mode 100644
index 9cc1bc5b809..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_null_type.php.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipNullType
-{
-    public function run(null $name)
-    {
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_nullable_left.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_nullable_left.php.inc
deleted file mode 100644
index e3119646b16..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_nullable_left.php.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipNullableLeft
-{
-    public function run(?string $name)
-    {
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_possibly_undefined.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_possibly_undefined.php.inc
deleted file mode 100644
index 9ebdb4001bf..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_possibly_undefined.php.inc
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipPossiblyUndefined
-{
-    public function run()
-    {
-        if (rand(0, 1)) {
-            $name = 'tom';
-        }
-
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_union_nullable_left.php.inc b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_union_nullable_left.php.inc
deleted file mode 100644
index 4b77e7efb4d..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/Fixture/skip_union_nullable_left.php.inc
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\Fixture;
-
-class SkipUnionNullableLeft
-{
-    public function run(null|string $name)
-    {
-        return $name ?? 'tom';
-    }
-}
diff --git a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/config/configured_rule.php b/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/config/configured_rule.php
deleted file mode 100644
index 6070072ffe6..00000000000
--- a/rules-tests/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector/config/configured_rule.php
+++ /dev/null
@@ -1,9 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-use Rector\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector;
-use Rector\Config\RectorConfig;
-
-return RectorConfig::configure()
-    ->withRules([CoalesceToTernaryRector::class]);
diff --git a/rules/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector.php b/rules/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector.php
index c0b3e2acb68..33a00bdcf59 100644
--- a/rules/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector.php
+++ b/rules/CodeQuality/Rector/Coalesce/CoalesceToTernaryRector.php
@@ -5,25 +5,19 @@
 namespace Rector\CodeQuality\Rector\Coalesce;
 
 use PhpParser\Node;
-use PhpParser\Node\Expr\ArrayDimFetch;
 use PhpParser\Node\Expr\BinaryOp\Coalesce;
-use PhpParser\Node\Expr\Ternary;
-use PhpParser\Node\Expr\Variable;
-use PHPStan\Type\ErrorType;
-use PHPStan\Type\MixedType;
-use PHPStan\Type\NullType;
-use PHPStan\Type\UnionType;
-use Rector\PHPStan\ScopeFetcher;
+use Rector\Configuration\Deprecation\Contract\DeprecatedInterface;
+use Rector\Exception\ShouldNotHappenException;
 use Rector\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
 
 /**
- * @see \Rector\Tests\CodeQuality\Rector\Coalesce\CoalesceToTernaryRector\CoalesceToTernaryRectorTest
+ * @deprecated This rule is deprecated, as risky. The "??" and "?:" operators are not interchangeable: "?:" also falls back on empty string, "0" and empty array. A regression must be fixed manually, so the rule is removed instead.
  *
  * @see https://github.com/rectorphp/rector/issues/9730
  */
-final class CoalesceToTernaryRector extends AbstractRector
+final class CoalesceToTernaryRector extends AbstractRector implements DeprecatedInterface
 {
     public function getRuleDefinition(): RuleDefinition
     {
@@ -62,43 +56,9 @@ public function getNodeTypes(): array
      */
     public function refactor(Node $node): ?Node
     {
-        /**
-         * indexed data maybe false positive
-         */
-        if ($node->left instanceof ArrayDimFetch) {
-            return null;
-        }
-
-        /**
-         * Scope needs to use parent Coalesce to properly get type from left side of coalesce
-         */
-        $scope = ScopeFetcher::fetch($node);
-        $nativeType = $scope->getNativeType($node->left);
-
-        if ($nativeType instanceof ErrorType) {
-            return null;
-        }
-
-        if ($nativeType instanceof MixedType) {
-            return null;
-        }
-
-        if ($nativeType instanceof NullType) {
-            return null;
-        }
-
-        if ($nativeType instanceof UnionType) {
-            foreach ($nativeType->getTypes() as $unionedType) {
-                if ($unionedType instanceof NullType) {
-                    return null;
-                }
-            }
-        }
-
-        if ($node->left instanceof Variable && ! $scope->hasVariableType((string) $this->getName($node->left))->yes()) {
-            return null;
-        }
-
-        return new Ternary($node->left, null, $node->right);
+        throw new ShouldNotHappenException(sprintf(
+            '"%s" rule is deprecated, as risky. The "??" and "?:" operators are not interchangeable and a regression has to be fixed manually',
+            self::class
+        ));
     }
 }