On your point #2, I disagree that a 20+ minute playtime is perfect for mobile devices. That just seems like too big a time commitment for me if I'm interacting

On your point #2, I disagree that a 20+ minute playtime is perfect for mobile devices. That just seems like too big a time commitment for me if I'm interacting with my phone; perhaps it is different with a tablet, but at that point it just feels like a PC game on your counter. I also don't know which PC games you're playing that require multi-hour commitments, but the only one that comes to mind for me is Civ5. Everything else I play, I play small chunks, and a given "match" requires no more than 30 minutes at the most. I don't play LoL or Starcraft II, but do play SMiTE and Company of Heroes II.