Putting aside Waymo specifically for a second (whom I believe is the leader in the space, but also self operates their own custom cars).
If the current state of commercially available ADAS was dramatically reducing accident rates, then Teslas etc would have lower insurance rates. And yet they instead have higher insurance rates.
AFAIK, it's due to things like single frame construction and expensive + backlogged parts which you order directly from Tesla (as opposed to, eg, a drivetrain that may be made for 3 separate manufacturers).
Or, when you do have an accident it's typically more expensive to repair.
I think my car insurance policy actually does detail what they believe every part of your body + your life to be worth, it might be my old policy though. From memory an arm was £2,000
[Edit]: found the policy:
death: £2,500
arm or leg: £2,000
blindness in one or both eyes: £2,000
As my father quipped to me when I was younger: 'You know the best thing about a three-legged dog? It's not sad about the limb it's missing: it's happy for the three it still has.'
I don't think that's possible. I don't think this is a "cooperate greed, nobody wants to end the gravy train by starting a price war" situation. I think it's a "the myriad of stuff you have to do to run a compliant company sets the price floor" situation. The fact that there is no nuclear "well I guess I just can't afford insurance, if I lose my house so be it" option available to customers prevents it all from caving in.
If the current state of commercially available ADAS was dramatically reducing accident rates, then Teslas etc would have lower insurance rates. And yet they instead have higher insurance rates.