For the desktop, if you think people don't use desktops you're out of touch with reality. Microsoft introduced the Surface Studio primarily targeting what Apple has started to abandon, creatives & creative professionals.
A 27" Cintiq tablet costs $2800 on Amazon, and that's without the stand, which is an additional $600. This is what video editors, audio engineers and graphic artists use in their studios. The Surface Studio replaces all of that -and- it replaces the computer itself. What are you missing here?