Currently, if you rename or move anything in the Hierarchy that has an Animator, you just get (THIS IS MISSING!!) alerts in the Motion editor.
Would be nice if the renaming just updated in the the editor, instead of losing the object entirely.
Have you submitted an issue tracker or feed back post for any of the shortcomings you mention?
I’ve seen several posts where you mention improvements for Unity but without creating issue tracker or feed back post I’m unsure if they will get any attention here in the forums.