I think the goal of scale-up would be to make it so easy people just put it in. Swiping up and down on the phone could be pushing up and down on the joystick on the Xbox, or using the scroll wheel on the PC.
In theory. Obviously if not adjusted some, user experience suffers. But the idea is to make it so easy to adapt to different form factors, it just seems normal to. (People expect these days that their Android phone or iPhone app will work well on an Android tablet or iPad, for instance.)
