I'm with the Mozilla commenter who suggests "If the feature should be deprecated, the first place for such a change would be the platform toolkits". I sometimes use apps where Ctrl-V doesn't paste, and they drive me crazy.

I would also argue that they should leave middle click alone - "some users are confused" doesn't strike me as a good enough reason for removing a 30-years-old Linux feature (someone will always be confused) and I'm willing to bet they don't have enough data to onow how many users are not confused.

Then again, Gnome's "we know better than you" attitude is why I switched to Mate years ago.