In any case, how would you measure when FSD/AP "saved butts"? Every driver is expected to operate the systems with the same ability and awareness to manually intervene (i.e. save themselves) as if the automation wasn't in place.
I would not know how to measure it, but Karpathy provided a clear example during a talk at CVPR 2021 where the FSD (rightfully) slammed the break as a driver was driving his car literally into a lake.
1. drive straight into a concrete barrier https://youtu.be/Tr-oF7J0cBw?t=13
2. drive straight under a tractor trailer https://www.youtube.com/watch?v=9BgV-YnHZeE
In this instance
3. Come to a complete halt in a tunnel with busy high speed traffic for no apparent reason.
And the excuse that the driver should have been ready to take over within fractions of a second of the Tesla making a mistake while in FSD is absurd expectations on human reflexes and attention.