K9 mail will stop working with Gmail soon anyway, as Google has announced they will be terminating standard IMAP access and other so-called "insecure" methods, in favor of their proprietary "Sign in with Google" system, or OAuth2. The hostility is beginning to take the shape of a pattern.
The writing is on the wall:<p>If you value choice and open ecosystems, do not invest in a future where you rely on Google apps any more than you need to.<p>Big G will burn you and not care at all.
Well, I hope they sort this out. K9 is my "Plan B" after my GAFYD/Google Workspace free subscription is terminated. Keep the email address, but necessarily off Google and off their native email client. Mostly because I still want push mail aka IMAP IDLE, which works (tested it) with my chosen replacement mail provider and K9.