Your opinion does not agree with the conclusions of the HTSA report.
It looked at driver engegement and how it was affected by driver assisting features. Conclusion is that indeed some periode of inattentiveness exist but rarely bigger than 5 sec. So the 7 seconds in which the driver did not react to the truck crossing his path is very exceptional.
Secondly they looked at the amount of accidents and collisions of Tesla's before and after the Autopilot was introduced. They fell by 40 percent.
In my opinion a good attentive driver, even with automatic systems engaged, will still keep his attention where it belongs: on the road.