Mimestream

Google has been adding hard-to-disable AI features to Gmail. I stopped enjoying the Gmail UI years ago, and really using Fastmail instead for my personal email. But, work email is usually Google.

I've been using Mimestream for my work Gmail account and highly recommend it. It's somewhat expensive, but worth it for me: fast, slick, and has just the features I want. If you're frustrated with Gmail's UI, check it out.