I'm quite willing to believe that self driving cars on an expressway that is not undergoing maintenance and in weather that isn't too appalling are significantly safer than human drivers. The worst human drivers are really atrocious. The barrier isn't high.
But I think it is likely to be a long, long time before current map based driving systems are able to navigate suburban or rural roads, deal with detours, pets, or kids, or livestock, or wildlife, or pedestrians with or without strollers, or utility crews, or guys trimming trees, or road crews digging deep holes, or folks signaling a left turn while turning right, or falling/drifting dust or snow (where the hell is the edge of this road and is there a ditch?)
Then there really is a problem with the sales guys overpromising. Are you aware that ABS braking systems worked abysmally for years -- OK on dry roads. not awful on wet roads. Useless or worse in sand, snow, gravel. Probably not, because no one went out to their way to inform the public
I'd like nothing better than to pay someone to install a box or three and a few actuators and sensors that will do my driving for me. But I don't expect it any time soon.