I have been using Mail for many years. Like OP, I have Gmail on own domain (in my case it’s the old personal G Suite offering). Additionally, I have a regular Gmail account and iCloud’s built-in email. Like OP, I did a clean install when Catalina came out (got a new laptop around that time).

As far as I’m concerned, Mail is one of those things that consistently just works. The only issue I used to have was quirky undo/redo of archivals/deletions, which I believe had to do with Gmail’s IMAP servers and/or the way Mail talks to them, but I am not noticing that lately.

If I were OP, I’d consider again whether third-party software that they and their coworkers have in common is wreaking havoc here. If there’s no such software or the issue manifests itself on a clean system without any third-party apps at all, then this Heisenbug should probably on Apple’s Radar…

The best thing about Apple Mail is their integration with contacts and everything "i" Phone, Pad, etc.

It is the whole ecosystem lock down deal again. Nothing has progressed in tech in this aspect, each company is still for themselves instead of consumers.

If people keep alligators at home, and some are eaten by them, the assessment of them being unsuitable for pets is not subjective.

I have 16 GSuite accounts setup and have never had this issue in Mail. Even if my account login fails or the server is unreachable, the app does not automatically come to the foreground. I don't use full screen or spaces though (I prefer Moom) so maybe that's why I have never seen the issue.

Same. The only issue I have noticed is that Mail sometimes freaks out when I lose internet connection. It’s pretty rare for that to happen and it doesn’t freak out every time, either. I have not experienced any of the bugs other people are having.

I have six different email accounts with a ton of folders.

What configuration are you running? This bug happens to me several times a day, though I am trying to close Apple Mail when I am not using it, but that's easy to forget and also annoying.

No, it has a lot of memory corruption issues. Try adding another account (or don't if you need the app to keep functioning.)

I don't know if apple just decided to give up on it or what but it's got a lot of bugs that have been left for years.