I'm advocating for what I want. Apparently it's not what you want. You appear to want games to use a control scheme which is based on the keyboard and mouse. I've never found mouse control to be adequate for any gaming use, personally.
Then again, I don't play competitive online FPS.
Thank you. They may even get me as a customer regardless of this wishlist, if they come up with something I still consider attractive.
If they don't, well... I doubt Gabe Newell will lose sleep over it.
I have used Big Picture mode actually. It's OK, and I don't mind if that's the default UI for the Steam Box. It doesn't do anything to ensure the games are controller compatible though. Big Picture will happily show you those ones which are not.
Aside from my preference for a controller, where exactly does one place the mouse when sitting in a comfy armchair?
Let me answer the one actual question you posed to me, in your response to my first point. You asked "why", and the answer is quite simple.
For some time now I've been somewhat in the market for a small form factor PC to use with my TV. I've not got around to choosing one yet, because it's not the highest of priorities. Ideally I'd like something that vaguely resembles a games console, but is in fact a full-fledged PC.
I want to play some games on it, but I also would like to use it for other things like media playback. I'd like to be able to install games from other sources than Steam too, so openness is an issue.
Why I asked about other distributions is simply because I have a distaste for Ubuntu Linux.
The Steam box seems as though it has a chance of fitting these specifications pretty well. If I "bought a PC" I'd likely get something that doesn't resemble just another set top box. That would be fine, but not ideal. Also, I'm (unlike a lot of PC users) quite happy to have someone else pick my hardware configuration for me, as long as they pick one that works well.