I actually think that the less a driver has to do, the worse they’ll be at reacting when a situation does come up.

If I’m actually driving and someone, say, runs out in front of me, I’ll slam on the brakes. I’ve had this happen, actually - it was scary as hell because my brain froze up, but…fortunately for us and the guy, my foot still knew what to do, and we stopped in time.

But if I’m sitting in the seat, just monitoring, not actively doing something, my attention is much more likely to wander, and when that incident happens, my reaction time is likely going to be a LOT slower, because I have to “mode shift” back into operating a car, whereas I was already in that mode in the incident above. I don’t think the manufacturers are adequately considering this factor.

(I recognize this might not be a perfect example with automatic brakes, but I think the point is clear.)