This, in addition to some of their other UX changes (like moving to SVG icons) - just makes it feel like after 10 years I am no longer their user base, and from what I've read the team is unwilling to be flexible with these changes. Thanks for the middle finger. They're breaking things and I'm supposed to just be happy about it.
Regretfully I've fallen out of love with thunderbird, and i am exploring other clients. My needs are not complex, outside of perhaps the google auth song & dance.
I want thunderbird to be the FF of email clients.... I guess in a way they are. Open source disappointment that pushes people to non-open solutions.