It’s still in active development, but you might want to keep an eye on Plasma Bigscreen. I’ve been looking for a similar setup to you, and it seems to tick all of the boxes, at least for me.

I only learned about it recently, and I’ve been too busy to try it in that time, but I’ll edit this post with my impressions once I get the time to have a play with it.

Imagine downvoting “Be careful what you expose to the internet”. I thought I’d got away from Reddit.

Well this thread is an absolute shitshow.

Jellyfin is great, but if you refuse to let yourself understand that Plex’s ease of setup for remote access is a point in its favour - especially when sharing with non-tech savvy people - then you’re just as bad as the supposed “Plex shills”.

Plex is well on the enshittification train, and I’ve always been a bit concerned about how private it may or may not be, but there’s absolutely no way I’d have been able to share a Jellyfin instance with my grandfather, especially as his dementia got worse.

I don’t know whether it’s me or my hardware, but display managers seem to absolutely hate me. I’ve tried quite a few, and I’ve always encountered some sort of issue within a few days. Even on distros that install and set them up automatically for me.

Since I’m the only user of my computers, I’ve set mine up to log me in and startx (well, now the Wayland equivalent) automatically, bypassing DMs altogether. If I decide to experiment with other window managers/desktop environments, I just change the line in my bashrc.

If you have a 3D printer that can’t connect to the internet, you could try Octoprint.