You are entirely wrong as horse and buggys were limited by the power of the horse, and the people riding the horse and buggy on the cobblestone road did not have a smooth ride. As such there was a need to develope something that could overcome these hurdles, because the technology at the time could not keep up with the need.
Actually it doesn't matter how smooth the ride is. I CERTAINLY wouldn't drive a ferrari down a cobblestone/dirt/rutter road. Would bottom out and tear the car up. Plus I wouldn't get there anywhere near as fast.
So we could stick with the dirt roads and ride buggies or we could build a nice road and drive ferraris. I know where I want to go