Comment by nradov
From a consumer perspective, no one cares what Waymo really is. If customers can pay and get from point A to point B reliably and safely then it doesn't matter how the sausage is made. Regardless of technical challenges and limitations they're obviously going to expand coverage to more areas.
If you put human lives on the line, both on the shared public road and inside the Waymo then how the sausage is made totally matters, as directly applies to what the failures modes are. Safe from A to B only holds in ideal conditions and limited zones. The hard problems like rare edge cases, weather, unpredictable humans, are precisely why it cant scale easily.
If the tech was truly solved, Waymo would not be geo fenced or expanding so slowly.