I have no idea if Betterbird is actually better than regular Thunderbird, but I use that cause people said so and I read about it a bit. If it does die I guess I’ll switch to Thunderbird, just a little cautious about Mozilla after the privacy policy fiasco.
Betterbird is in flathub too which is great for newbies like me.
Can verify, use Silverblue and it was plug and play for me back when I first used it around January.
Updated the kernel to 6.13 around February/March and broke Bluetooth for me. I have no idea how to fix it besides rolling back to a prev update.