Does he have a MSc?

In my experience, Steam client and most games work great on Debian and Ubuntu, but you should know for GNU/Linux systems, it's only officially supported on Ubuntu (maybe SteamOS is implicit), I can't find the information on Steam's website or support pages, but this is a response I got from Steam Support when reporting a Steam client UI bug on Debian with GNOME, a while ago.

Yeah, beating your cob for too long does that.

Not Searching For Wheat, indeed, it's a cornsite.

I don't need any of the 3 announced Steam hardware products, I already have a decent gaming PC running Steam on Ubuntu, a VR headset (Meta Quest 3, that I would not have bought had I known earlier, though it works wonders streaming PCVR games through ALVR+SteamVR) and a classic Steam controller that is more reliable that my Xbox One one on BLE.

But I do benefit from the announcement, because this means Valve will continue investing in the GNU/Linux ecosystem, and this will net more Linux players, which in turn means better software overall. Yay!