In my dim recollection, I've used mail clients that used OAuth for IMAP access, plus it appears they are not taking away App Passwords, which I use for almost all my mail clients.
No, you can use IMAP without password, using app token like any other OAuth
This is turning off IMAP. The Twitter/Google invented OAuth they pushed on the IETF is not part of or relevant to real IMAP. It's just mega-corp crap. Especially OAuth 2.0.
You can also still use an "application-specific password".