I tried Kodi with Libelec but it’s still so jank. The Plex app is broken, there is no invidious or YouTube app I found that works. And sometimes it just “thinks” forever and I need to get up and unplug it.
I saw that Plasma Bigscreen was revived and it looks promising, but they don’t have a release yet.
Are there any other options?
I use mythtv (FOSS) and it’s fine as a PVR (schedule, record and playback broadcast TV) with a SiliconDust HDHomeRun network-attached tuner. It also has playback for downloaded files but I prefer to use mpv for that. Mine is still connected to the internet and I use firefox/transmission for youtube and other functions.
No idea about plex or jellyfin.