From the article in the OP: "For an average user the differences between the pro and RT are slim."
The average user browses the web and checks email, and maybe plays some casual games like Angry Birds or Solitaire. For them, there really is no difference. I've recommended Windows RT to my wife and she agrees.
While I do think they need to explicitly say that it cannot run desktop applications, I don't think this is as big of a problem as people think it is.
So an RT tablet is better the android or iPad? How so? Future killer apps?