And the fact that pilots spend a lot mote time in training than drivers, and the fact that there are two pilots, and Air Traffic Controllers, and computers constantly checking the pilots input as well as the flight conditions, and ...

That helps prevent pilot errors. It doesn't help identify mechanical/software failures after the plane is in billions of tiny pieces.

Also, plains undergo near-constant diagnostics and preventative maintenance work.

Don't most new cars carry some kind of data recorder? If a failure is due to pilot error or lack of maintenance, we can at least use the data pulled from the melted, twisted wreck to rule out design flaws.

They do, but its built into the airbag system, and only commits the last 15-30 seconds of vehicle data when the airbag is triggered.

Tesla and GM vehicles have more sophisticated telematics than other car makers, and I'm sure Tesla is taking advantage of the data (battery pack performance, etc). You'll also get a call if your battery charge drops to a level that will damage your battery.