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.