Key sentence: "Unless you know Linux users, you cannot get in-person help."
This is, I think, key to OS adoption. Would you have used MacOS way back when if you had been surrounded by Mac users? Of course.
There's also services like GeekSquad and the Genius Bar, as well as others, to bail out users...that's more along the lines of what I meant by that sentence.
Anyone who thinks you can use the same desktop metaphor for a tablet device as for a PC ought not be allowed anywhere near a UI.