To be fair, Round Rock is 20 miles away from downtown Austin. While growing up in Austin we didn't view Round Rock as a suburb, but as a completely separate city that happened to be fairly close by. It seems only normal that someone would want to work and live in the same city, and for that need not to be seen as a flaw in either one.
You are right that round Rock is not Austin. The point is that the radius from the city center that is acceptable to commute from is rapidly shrinking in austin. People are flocking here and the only option is to drive on mopac or 35.
