If I were to argue about manual driving from my personal driving, I'd be way off. I haven't had an accident in decades. Not even any close calls. If I extrapolating my accident rate out to the world, I would assume that human-driven cars are a perfectly safe technology.
In the real world, all accidents are a long-tail phenomenon. They happen pretty rarely, often under conditions that are unusual or unexpected. So somebody saying "in these last few months I hardly ever have to intervene anymore to not die", a standard that would cause a driving instructor to fail a teen driver, not only doesn't give me confidence that this technology is a-ok for road use, but suggests to me they haven't really thought about what is required for safety at global scale.