I know its silly to say, but I feel like I have much less patience when playing on a touchscreen. It feels much harder to think about the geometry of moves in that way.

That said, I don't think this is the same for everyone, just my observation.

I find the same for Scrabble and Monopoly, though on an iPad rather than a phone. The old version of the Scrabble app used to let you put an iPad on the table for everybody to see, then use the iPhone/iPod as your personal letter rack so people couldn't see each others' letters.