Re: SteamOS
You're out of date and misleading. All graphics cards work on Linux (Mint specifically). You may not have the fancy controls but they are all GPUs rather than basic VGA. You generally don't have to install anything unless you want to make sure you have the OpenCL compute stuff.
The major factors stopping games on Linux are the DRM and Anit-cheat features naturally.
Yes SteamOS is dead but that's understandable, it was half arsed. It's also not that important for PC gaming. The idea was to provide a console like experience. This has been achieved with GamerOS which is basically Steam in BigPicture mode with no desktop or LibreOffice. It really does turn a PC into a console and is what SteamOS was pretending to be. I'm still not sure if this is a good idea though.
I've been building Windows 10 based gaming machines because people want to play Fortnite. Other than DRM and Anti-cheat games Steam has you covered on Linux. Let's see how Cyberpunk 2077 gets in Linux, seems about the same as Windows so far.