The personal computer is not a form factor, it is a philosophy. No dependence on centralized service, computing done by the user, for the user. Unless done properly, cloud and toys (smartphones, tablets) are a regression into the mainframe era. Give your toys enough control and you'll see.
Mod parent up! These days I use a laptop rather than a desktop; it's just more convenient. But it's still my personal computer. I'm not dependent cloud services, or even in some cases even a network connection, to do useful work; and I control the software and data on my device.