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1. Why is that obvious? 2. "only? 3. Why do people care? Not necessarily you, but commenters on reddit, The Verge and others are practically angry at Valve supporting Linux.
I hope this doesn't offend anyone, but I get the impression that Linux-on-the-desktop peaked a couple of years ago, Now, with the Unity/Gnome 3/Mint/etc. mess, the momentum Ubuntu had has fragmented into several diverging paths. It seems harder now to recommend one single Linux distribution for the average user than it was two years ago. On top of that, the PC itself seems to have peaked. It's hard to think that Valv…
What mess? Unity is getting to be quite tolerable. Gnome is forging ahead with their vision and Mint provides a nice alternative to Ubuntu with several different UIs. I don't understand the argument that this is "bad". People have been saying that since the dawn of Linux and it's boring and an non-point.
If you accept that "PC" has peaked, Valve/Steam is screwed anyway. If consumers keep flocking to iOS/Windows8, let alone to Android... then Steam will die a painful death and modern computing will be reduced to mindless one-at-a-time "apps".
Ironically, the "mess" of Linux desktop is the only platform that isn't going for a signed, verified, OEM only software model eroding consumers' rights and freedoms along the way.