I have no issues with the tech and the goals of Waymo; here is their test "protocals".
https://assets.ctfassets.net/e6t5diu0txbw/2ixrl74N2SPK4qwIAdJI8E/8d69b50a102b8f2638a2334ff86dd28b/Collision_Avoidance_Testing_of_the_Waymo_Automated _Driving_System__1_.pdf
I could drive a Waymo Semi Tractor trailer through that document.
Operating a car autonomously on roads makes unmanning aircraft look like a lay-up.
There is a reason Waymo started operations in Arizona...the amount of influences on an autonomous car are exponentially more daunting than what a drone senses.
My issue is, as always, when are conditions too much for Waymo and the park themselves. They must come to grips with that. Aviation does.