Actually placing an item (static, moveable or volume) and rotating keep its axis on world orientation. Align items (i.e. statics) to specific geometries could be very time consuming, because it needs to be moved both on X and Z axis, with progressive minimal movements to align correctly. Switching to a local axis that keeps orientation given by the item rotation could really speed up the task using just an axis.
Actually placing an item (static, moveable or volume) and rotating keep its axis on world orientation. Align items (i.e. statics) to specific geometries could be very time consuming, because it needs to be moved both on X and Z axis, with progressive minimal movements to align correctly. Switching to a local axis that keeps orientation given by the item rotation could really speed up the task using just an axis.