It is actually much darker than training.
The MCAS was kept hidden from regulations and manuals as the aircraft manufacturer involved was trying to market the aircraft to only be another variation of the line, not requiring any recertification or training.
After the first accident, the aircraft manufacturer disclosed the existence of the MCAS and issued some directives to mitigate its influence. But it did not prevent the second accident. In this case, the involved airline indicated the pilots could not regain control even when carrying out the procedure.
Long story short, the MCAS relied on a single AoA sensor which was the major gamble taken.
Anyway back to car's auto pilots.
I don't know if you heard, but Cruise's driverless Taxis have completely shut down operation because of an incident that contributed to the injuries of a pedestrian. The pedestrian was hit by another car, and landed underneath the Cruise's driverless car. At first the Cruise car immediately stopped. But then it resumed course and dragged the injured pedestrian stuck underneath it on a distance of about 20' before stopping again.
Initially, Cruise only provided the video showing the Taxi stopping with the pedestrian underneath the front end. Failing the disclose the part showing the Taxi resuming motion.
As a result, Cruise has been shut down from operating, and the CEO resigned.
Bottom line, there always be situations which have never been hard coded. There always are going to be software bugs each time there is an update. This is how it works. You always break a feature that was working perfectly before.
As we progress, more and more features are going to be incorporated, but at the price of what we have already seen happening since the introduction of auto-pilots on cars.
We are basically guinea pigs. Car makes are advertising auto-pilots as non autonomous, but it does not matter to some of the drivers.
This is why I am happy with my driver's car; it has zero electronic features, no automatic gearbox, making it virtually impossible to drive while operating your phone.
This is also my main argument on discussions about motorcyclists being reckless. I can't ride and text.