I’m not a pilot, but my impression is that the reaction time required to take over in a dangerous situation is much less strict with planes than with cars. Except when the plane is close to the ground, I suppose, but pilots know when this is happening and can specifically pay more attention for that brief period. The plane autopilot physically can’t cause you to crash within a second at any point mid flight, AFAIK, unlike with a car “autopilot”.