Valve Removes Steam Machines From Its Home Page (extremetech.com)
Steam Machines were supposed to take PC gaming mainstream by simplifying setup and moving the games in your living room, but they never took off. Today, ExtremeTech reports that Valve has removed Steam Machine listings from the Steam front page due to poor sales. From the report: You can still access what remains of the Steam Machine landing site via a direct link -- not that you'll see much when you get there. It lists only five devices, one of which is no longer available on the manufacturer's site. Several of the remaining systems are arguably not even Steam Machines as Valve envisioned -- they run Windows 10 instead of SteamOS. The final nail in the coffin for Steam Machines may have come from Valve itself. In late 2015, it released the Steam Link. It's a small box that you plug into a TV, allowing you to stream a game from your PC in real time. The original price was just $50, and Valve is basically giving them away right now. Valve is still developing SteamOS, but I don't expect that to go on much longer.
I think it was a JOKE. He didn't say "Don't game ON Linux" or "Don't game WITH Linux", he said "Don't game Linux". It is a play on gaming the system.
Linux is a competitive gaming platform.
You don't need more than a graphics card, a keyboard and a mouse to play a game.
And as far as I know, Linux supports Open GL just fine. E.g. Descent, one of my favourite games: https://www.dxx-rebirth.com/
The problem is that there are no mayour players targeting the market. I for my part would love to _write_ a game on/for linux, but I suck in marketing and doing it for free, I don't have the time.
Cost free eBook I read (by iBook/Kobo/Amazon/ObookO/Gutenberg etc.): "The Green Odyssey" by Philip Jose Farmer.