I use Chromecast with android TV, it's about perfect with jellyfin, and if I were to domit again I'd probably spend the little extra for the 4k model even though my TV is 1080p (more horsepower). You can run a different homescreen to somewhat degoogle it.

Probably not what you're looking for given what you've lined up here, but I live and breathe with it every day and it's great, and as an added benefit you can cast from a lot of services or websites as well.

My plan is to use the $20 Onn (Walmart store-brand) Android TV box LTT recommended as being eminently jailbreakable about a year ago, but I haven't actually gotten around to hooking it up yet so I can't authoritatively endorse it.

I've personally been using a raspberry pi with a Bluetooth mouse and keyboard. I just run jellyfin in Firefox and navigate with the mouse - the keyboard rarely ever being necessary. I was able to increase the icon size so it's acceptable on a tv and bookmark any streaming websites I use. It's certainly not as clean as using something like an apple tv, but it's serviceable and I don't have to fiddle with plugins like when I tried Kodi. Honestly though, apple tv probably fulfills what you're looking for like others have said.

If it's an option, the Xiaomi mi box it's a cheap android TV device that plays probably everything. Costs around 60 euro in eu. If not you coul always go for Google TV with a custom launcher to block stock android launcher ads.

It's surprising how slow open source is on replicating Roku. So many manufacturers could be using Linux to bypass androidTV and RokuOS bullshit. I suppose AndroidTV is good enough even despite that.

👋😢

3. If you do not want stuttering, use a graphics card. Higher energy consumption but you can play everything