VP9 support is just as promiment as AV1 support in the specs. https://www.apple.com/apple-tv-4k/specs/
I do this too with a mac mini app that does it on schedules across all the channels I like, dumps them in JellyFin with channel art, culls old videos, and uses the Jellyfin api to reindex that category when done.
I just like the lack of ads and no separate YouTube interface… YouTube is just a category in JellyFin.
yt-dlp has gotten spotty about YouTube blocking it, from time to time, though.
I sometimes see the homepage, or see thumbnails when I click to download individual videos. I've previously found interesting channels that way, or recommended by creators in videos I watch, or even on HN.
(I've found their algorithm has gotten worse over time, and nosedived recently with AI slop propagating like crazy in 2026. Even for niche topics it'll recommend channels that are a month old, already have 60 videos (mostly with low views but one video with 100K+ views), and obviously AI generated when closely inspected. It's worse now because half the channels use AI thumbnails for non-AI content.)
So after that long answer, I don't have a great recommendation for discovery if you don't already have an existing list of channels you like and trust.