1. They're not "safety drivers" in the sense that most people understand, ie. someone dedicated to watching the car
2. What's with the fixation on defining "fully autonomous" to mean 0% human intervention ever? If a vending machine works 99% of the time, and 1% of the time needs some technician to come to get a drink unstuck does it make sense to get up and arms about how it's not "fully automated" or whatever? In all contexts why people would care (eg. unit economics, safety, customer experience), there's no meaningful difference between 99% autonomous and 100% autonomous.