The idea of having a phone that can Desktop seems like an end-game for an all in one device. Take it with you anywhere, come home, plug to dock, start working, undock, connect to keyboard+screen device - laptop - disassemble keyboard+screen, take screen - tablet.

The idea of having a phone that can Desktop seems like an end-game for an all in one device. Take it with you anywhere, come home, plug to dock, start working, undock, connect to keyboard+screen device - laptop - disassemble keyboard+screen, take screen - tablet.
https://volla.online/de/index.html

Take a step further and make the form factor into a watch. 

Having a Tablet, Laptop, Watch, and Phone is what I would call Handheld Hell(?)

imho (and yes this is reductive), the higher the transistor density, the less battery weight one needs to carry around.
ideally I'd have some sort of hands-free, mostly AR interface for what might be a "tinybox" at home + MPC everywhere else.