one fine sunday morning, i was driving on highway....normal hwy speed. then suddenly the run flat tire indicator came out. I stopped car & noticed one tyre was almost flat. since its rft, so i continued driving at recommended speed & reached destination safely. no tyre shop open at that time to repair. so i continued doing what i was supposed to do with one tyre flat until I repaired it. that's how i see the advantage of rft.
bare in mind that changing tyre at the road side can be a hazard & dangerous. people got killed when car or bus run over them while changing tyre esp on hwy. Ppl might rob you at the road side. driving normal tyre while it's flat will damage i.e tear the tyre apart.
So, for safety reason & convenient, I would stick to rft.