Having an aircraft a good distance east of ADS go NORDO in IMC gives you some time to get stuff out of the way for the anticipated turn back to the VOR (which sits immediately south of DFW, and the aircraft will possibly pass over DAL on the way).
Having an aircraft just southeast of DAL (which is where it's usually realized that a true NORDO situation exists) make a right turn to DFW...well, it doesn't really give you any time to shut down DAL, shut down both sides of DFW, and alert all the departure controllers that things just went pear-shaped.
But it's kind of like wet paint, people seem to have to touch it once just to be sure it is wet. Then they won't do that (go RWY heading in solid IMC) anymore.
