They can’t possibly have addressed every possible weather and traffic-related condition. Heck, Waymo just pulled their vehicles in recent weeks because one of their self-driving vehicles drove right into a flooded area. Imagine one of their taxi vehicles doing that with people inside.
Teslas have logged over one billion miles of driving. All that driving data is logged, analyzed, and used to train and interact with every Tesla, even in real time. Their reaction time is second to none. A Tesla isn't a Waymo. A Tesla isn't going to drive into a lake.