I wish I remembered more details but the consensus seemed to be to stick with Thunderbird. I use it every day and the new v115 really made it feel new again.
I appreciate this perspective and that was also my immediate reaction. Then I realized, as long as I can easily export my data and move elsewhere, I shouldn’t be too concerned.
I was forced to move my instance to my home IP. I think Google is flagging anything that might not be residential, mobile. I’m only really using it as a backend for iOS devices using Yattee.