All the option does internally is reverse the order of the rotations, but this is the same as old "Rotate Euler" node, and it's a bit more intuitive this way. Also use the same socket names, "Rotation" and "Rotate By" which are much more intuitive. Technically it would be better to not have to duplicate the multi- function just to switch the order of the arguments. But the evaluator assumes that the order always matches the socket order currently. Pull Request: https://projects.blender.org/blender/blender/pulls/117899