I think you might be mixing together the problem and one possible solution. People definitely want to be able to use different form factors in different places

I think you might be mixing together the problem and one possible solution. People definitely want to be able to use different form factors in different places. One way to do that would be to carry around a central GPU+Memory store. Another would be different devices interconnected through a network - and the world that's being made is the latter. Right now I can leave off in the middle of an ebook on my tablet and pick up at the same spot on my phone (Kindle). Same with videos from my TV to my phone/tablet/computer (Plex). It gets a little trickier with development environments, but if I was sufficiently motivated I could do everything in a VPS that I accessed remotely, or use Nitrous.io to get a web accessible IDE (though I'm not sure about using a watch for programming). I think this is mostly prompted by the fact that on the hardware side - everything is very custom and tailored to that form factor (to keep size and weight down, we've got all these systems on a chip and custom shaped batteries).