Why not start with 1 car, 10 cars, 0.1% and beyond. My point is prerelease testing can only catch so much. you can think of many bugs that affected only people

Why not start with 1 car, 10 cars, 0.1% and beyond. My point is prerelease testing can only catch so much. you can think of many bugs that affected only people with certain settings etc. It is hard to replicate all the conditions appearing in the wild. This could be as simple as "last software/firmware version", or as complex as "car stalls as it makes a u turn". Hard to test all these.