Earlier quoted context omitted.
Vision also gives you unreliable output. Real world is messy and hard - sensor fusion and dealing with unreliable data is bread and butter. No one said it’s easy to build that stuff. Well, no one expect for Elon Musk to be more precise.
That last thing you want is two systems arguing about what they see. Also its lame to downvote for disagreeing.
Sensing of real world is really hard. Sensor fusion is a whole discipline.