Oauth is simple. OAuth2 is a protocol for making protocols and every mega-corp's implementation is different. It's requirement for email access in the mega-corp

Oauth is simple. OAuth2 is a protocol for making protocols and every mega-corp's implementation is different. It's requirement for email access in the mega-corp walled gardens breaks imap in the sense that just imap doesn't work anymore. And in the pragmatic sense that many smaller email clients don't and won't support all the various idiosyncratic implementations.