That's because legally, they are. However, it hasn't stopped Tesla from doing things like hold press conferences (in the case of a fatal collision with a Semi) to talk about how the car had warned the driver to hold the steering wheel, and neglect the trifling detail that it had done that
once, and it was
eighteen minutes prior to the accident. Tesla will happily throw you under the bus to try to protect the reputation of FSD/AP.
> Tesla make it abundantly clear that the driver is still responsible for monitoring.
Tesla had to be dragged kicking and screaming into doing this. When AP first launched, the steering wheel checks were every fifteen minutes, then reduced to five. It has only been through repeated cajoling that it is down to where it is now.
Let's not forget that "The driver is only in the seat for legal purposes. The car is driving itself." is still on Tesla's website to this day. (And in a sense, it is accurate - the legal purposes just include trying to shield Tesla from as much liability as possible). Oh, and Smart Summon. "Bring your car to you while you deal with a fussy child" (and still maintain complete awareness of your car...)