2) Only windows. Agreed. But I'm glad they did so they could get one platform dialed in instead of chasing multiple rabbits. For now.
3) Games - copying part of this - do yourself a favor and try with Elite Dangerous or Assetto Corsa. And gaming doesn't scratch the service in terms of application - training, social interaction, SEX, therapy, etc, etc.
As for 3: I played Elite for a bit. And then quit when I got motion-sick. I'm not particularly motion-sensitive, but DK2 got me there pretty quickly.
Maybe the retail one is better in ways that wouldn't make me sick in that case, but from what Valve people have been saying, the only reliable way to get rid of the sickness is to remove the disconnect between not-moving and seeming-to-move, aka make games that involve only your real-world motion.
If that's the case, it implies that what we need are radically different games than what we have. So I'd either want to see those games, or see some proof that you can do Elite-style gaming with no motion sickness even when playing for hours.
I feel pretty confident in saying that the people who spend big bucks on computer gaming are mostly not giving two shits about Linux while they do it. SteamOS and general Linux gaming is pretty decent these days but still... if you are a hardcore gamer, odds are overwhelming that you are running Windows.