I can heartily recommend going into your Google settings and disabling the global "smart features" option. It removes a huge amount of crap all at once.

For GMail, go to Settings -> General (https://mail.google.com/mail/u/0/#settings/general) and scroll down to "Smart features" and disable that.

Then go to the next option, "Google Workspace smart features" and disable them across your entire workspace with 1 or 2 more toggles.

Finally, just switch to Fastmail or something. :-)