I don’t expect them to never fail, I just want to know when they fail and how badly.

“Over 6.1 million miles (21 months of driving) in Arizona, Waymo’s vehicles were involved in 47 collisions and near-misses, none of which resulted in injuries”

How many human drivers have done millions of miles of driving before they were allowed to drive unsupervised? Your assertion that these systems are untested is just wrong.

“These crashes included rear-enders, vehicle swipes, and even one incident when a Waymo vehicle was T-boned at an intersection by another car at nearly 40 mph. The company said that no one was seriously injured and “nearly all” of the collisions were the fault of the other driver.”

According to insurance companies, human driven cars have 1.24 injuries per million miles travelled. So, if Waymo was “as good as a typical human driver” then there would have been several injuries. They had zero serious injuries.

The data (at least from reputable companies like Waymo) is absolutely available and in excruciating detail. Go look it up.