Its not „just turn on“ yet but we‘re getting there
I think we are 99% there. If you make a decent AMD based machine, install Bazzite on it, you can set it to “Open in Big Picture mode on startup”. After the initial configuration in desktop mode (you need to do this only once during installation), you can just start the PC and sit in your couch. No need to download drivers or any desktop shenanigans. You control it using any standard game controller. No need for a mouse/kb; just start and play.
Thats pretty awesome! :) thanks for sharing. Do you know by any chance if kodi has a steam app somewhere? I‘m going with a raspberry pi and it works well as a client for media but not yet for steam.