Measuring metrics that are easy to measure doesn't help if the metric doesn't mean anything.
Comparing collision rates between human drivers in all conditions and Tesla automation in conditions where it allows activation and is activated is simply not a usable comparison.
Certainly, there's not an easy way to measure the collision rate for all humans all cars in only the conditions where Tesla automation can be activated, and that makes it hard to find a metric we can use, but that doesn't mean we have to accept an unusable metric that's easy to measure.
Comparing collision rates between human drivers in all conditions and Tesla automation in conditions where it allows activation and is activated is simply not a usable comparison.
Certainly, there's not an easy way to measure the collision rate for all humans all cars in only the conditions where Tesla automation can be activated, and that makes it hard to find a metric we can use, but that doesn't mean we have to accept an unusable metric that's easy to measure.