Thunderbird + K9 Mail are my way to go, too.

Though I mostly do like the redesign, since it fixes some long standing issues with Thunderbird (e.g. not being able to select a multi line message view ("cards view"), instead of the traditional table view.) The search bar being always on top annoys me each time I open it, so I understand a more long time Thunderbird user might have more nitpicks. Almost all of the changes can be reverted through settings, which I find awesome.

I still have pgp signs, but no one has used it to encrypt back to me in years. Don’t know why I keep those on there and active

Me too. I mean if I got an email with someone's public key attached I'd send an encrypted reply. One day the person you're emailing will eventually do the same lol. (I mean I do get people sending me encrypted emails sometimes, but most of the time it's "wtf is this .asc file you've attached to this email")

The refactor fixed a ton of issues

The redesign is actually what convinced me to switch to Thunderbird. Otherwise I would've never used it since for me it was an eyesore!