I'm guessing the fact that they don't like an OS that comes with a store is because it would be a rival. Valve wants steam to be THE store for getting your games digitally. (And now also your everything else, now not being able to log in while offline will really be fun. Sorry son, you need an internet connection to open word.) A certain integrated store for games in a certain unnamed OS, could shake the status quo.
Horrible fucking idea, sadly with the size of Steams installer base it has no chance of failure.
Let's just hope enough software companies stay away from double dipping DRM, and cumbersome non stop crashing third party clients that take longer to start then my fucking OS.