I've been dreaming of a good "convergence" device that I can use as a phone but also dock and use as a PC for probably a decade at this point. I've kind of lost hope, it might happen some day but I doubt any time soon.
Desktop mode is pretty good, and it works with most hardware. It's plenty powerful enough to be a portable laptop, plus after the work is done you can pretty easily grab a few hours on a game :-D