Quality is fine, sounds like user error. Features sure, but that’s to be expected with a paid app.
Show me an AppleTV JellyFin client that “just works”. Something my mom & dad could use to watch a movie. Something that can do normal media player things like seeking or subtitles.
There is a huge disparity in the quality, support, and features of the various clients.
I don’t use Apple products so I can’t speak to the AppleTV support.
But your criticisms seem to be of clients for Jellyfin rather than Jellyfin itself.
They are effectively one and the same. You cannot use JellyFin without a client.
I set my parents up with infuse and it works fine with no issues. To be fair apple doesn’t seem to be very supportive of foss development on their devices
I’ll have to check out Infuse, thanks for the recommendation.