This was inevitable given Tesla calling the system an 'Autopilot', when in fact the driver must have their hands on the wheel and monitoring full time.
Using a soccer analogy, I can go to sleep watching certain Euro Cup 2016 matches, but if I were playing on the field, obviously that changes everything. With self-driving cars, I'm somewhere in the middle (basically, a benched player).
Aviation autopilot is very much "set waypoints, sit back", as if anything goes awry it lets you know, loudly, and then you have time to deal with whatever needs dealing with. The whole reason autopilot was developed was to combat fatigue related accidents - and it works.
"and maintain situational awareness." Some failures can happen quickly, and the plane can change modes unexpectedly. Plus the warnings you receive may not be accurate.. see Air France 447.
You can sit back, but your role is to constantly check your instruments, your performance, your route, your radios and your environment.
Autonomous cars on the other hand seem to be targeted just at that, allowing the driver to do something else like read or text or something.