When editing a release, there is a last tab, which shows the actual changes and where one enters the edit notes.
This is really one of the most helpful things, as it collects all the actual changes I've made, omitting everything else, thereby giving me a good way to check whether any undesired changes were made.

Unfortunately such a last "edit summary" tab seems to only exist for editing release...

I'd like to see that the same exists for all other kinds of objects (artists, release groups, relationships, labels, etc.).

And obviously this should also follow the ideas in MBS-8812.