That's going to improve the overall productivity of the worst (maybe) devs while hurting the productivity of the best ones. For the latter, it took years to get

That's going to improve the overall productivity of the worst (maybe) devs while hurting the productivity of the best ones. For the latter, it took years to get to the level of proficiency they are on now with their editor, and they are not going to be as productive in the new one for a long time[1]. You're intentionally crippling them by taking their tool away - why would you do this? Why do you expect they'll put up with it? [1] And that's assuming your chosen editor is objectively comparable in features with the one they used, which it probably isn't unless it's the one extensible in Lisp ;)