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I can do 2 out of 3. instead of running the abomination that is Kodi, you can install normal linux to the Pi (Raspbian), and then add on jellyfin-mpv-shim (or plex-mpv-shim) and macast (for youtube, peertube, etc and it also supports DLNA). they are sinks, i.e. there is no UI for you to interact with. instead, you use your mobile phone or tablet to browse your library, youtube, whathaveyou. when you want something played, you send it to the sink and it plays it in full screen. you can use the mobile device to control playback (pause, ff/rew, change subs, etc.).

can’t help with the gaming part, moonlight/sunshine should do that but I haven’t got any experience with them.

the Pi 4 you got is more than adequate for all the mentioned tasks.

I think you may have misunderstood.

I currently have a Pi running OSMC (basically Armbian - Kodi) which I am going to replace with my old desktop gaming PC, a Ryzen 3600/GTX-1080 rig, which can run Steam and any game I want to play on the couch with a controller locally under its own power.

I understood you fine. what I’m saying is, you don’t need to use the 1 KW PC when the 5 W Raspy can fulfill all the roles you stated - media playback (local and online) and remote gaming from your new rig. if you know Raspy’s power by way of the crap that is Kodi - a bloated, slow as molasses, buggy zombie patched for 20 years and held together by duct tape - then you might be surprised with how it can run. also, you have the option of running LineageOS AndroidTV with native apps for all three stated roles.

if you’re adamant about repurposing your old PC it in that role, your best bet would be bazzite, a 10-foot UI-having SteamOS clone. but then, you’re smashing into the wall that is Nvidia on Linux; a fun project but not really a plug and play solution for the living room.

What js lineage os Android TV? Couldn’t find it anywhere on my search engine.

Also I don’t know what people mean by “the wall that is nvidia on linux” I have been using my gtx 1660 on Linux and it just works. Since I use bauxite you can select your gpu model and it reinstalls nvidia proprietary drivers. I’m not sure what it’s like on other distros but it seems fine.

In fact I also have an rx 6700xt but unfortunately I could not get a display output on Linux no matter what I tried.