Library Collections, and the ability to dynamically place things in them via labels/rules! Meta data editing improvements as well- it's really easy to clean up and fix my library items now. Channels just keeps improving practically every week through pre-releases, and it is awesome to see.
The only "downside" from all of this work in 2022 is it makes me want to put strmlnks and videos in for absolutely everything I own, and right now that makes the client take a bit too long to load so only stuff more likely to be used goes in for now. But I consider that a Quality Problem- before all of the work this year, I didn't fully see Channels as an option to manage all of that media itself- but now I absolutely do- and I'm excited for every step that gets it closer! 