I just can’t find a decent email client that looks like it’s from the last 20 years. Geary and Evolution both appear to be pretty modern but something about using Gmail with a Yubikey just doesn’t work and neither of them will connect to my account. Both on Fedora and OpenSUSE. Thunderbird works but it’s so old fashioned and Betterbird doesn’t look much better. What’s everyone else using?
I think this is a fair question. I haven’t seen anyone mention the benefits of using a non-web mail client (OP mentioned Yubikey but 2FA isn’t uncommon with web mail). I would actually consider using one if it gave me clean up options (e.g. haven’t opened an email in 3 days and the sender is not in my address book move to Junk/Spam). Main reason I rarely look at email is that it’s 90% stuff I have no desire to read and marking things as spam is a never ending cycle.