Honestly as much as I hate google, Chromecast has been a pretty flawless jellyfin experience.
4k AV1 support (though I only have a 720p TV, so I got the full HD version), and the jellyfin client is one of the best and most updated.
In the 5 year future I want to be able to have a cheap N100 box (pis are too expensive and under powered in video, maybe the new RISCV SBUs will beef up decoding and be perfect for that a few revisions later) and then throw Plasma Bigscreen on it when it matures and have a fully FOSS streamer, but that won't work well now.