Are the airlines getting the functionality that was advertised when they paid the millions? Of course they are.
Is the FAA investigating the companies (that are selling AP to the airlines) for false advertising/misrepresentation? Didnt think so.
Next.
It's a lot more rigorous regulatory environment with aircraft. The manufacturers of all systems have to prove they operate as specified and then the FAA oversees that and certifies it.
It's the Wild West with autonomous driver tech, the regulatory environment is not very strict and only does something when bad things happen to many people, and even then they act very slowly.
If a plane's autopilot has a flaw and doesn't operate as intended causing not even a crash but some dangerous situation that the pilot overcame, the FAA grounds the use of it very quickly until it can be sorted out and re-certified.
If you look back at history (30's-40's-50's), the aircraft industry went through similar growing pains (the FAA wasn't even formed until 1958) and it took time to get the fairly robust regulatory oversight it has now.
Eventually, the hardware and software will settle down to be very safe and effective once the Wild West days are over. People will die, in all sorts of ways, until it gets to that stage and some regulator will then certify the new systems, just like with aircraft, to be safe and functional as specified.