It revealed that a human operator engages with the car in some way every 4-5 miles, and the (ex) CEO explained that this metric was stupid because human operato

It revealed that a human operator engages with the car in some way every 4-5 miles, and the (ex) CEO explained that this metric was stupid because human operators were always fully assigned. His suggested metric is cars/operator, which was ~20 IIRC. For Tesla, for the near future, that number is 1.