After rotation has been applied to an object, is there an easy way to re-align the move gizmo back to the object geometry?
NOTE : All gizmos in the image are LOCAL, not global. A shows the desired result, B is what I have now.
After you are done rotating the origin you can exit the Affect only - Origin mode.
Note : You can not only rotate the origin, but also can Move the origin and also use Snap features.