[deegles]

This metric is at best misleading. It's presented as a proxy for safety, but that should only apply to a single hardware/software combination.

I want to know how many miles are driven (both IRL and in simulation) per software release?

If you accept that the Autopilot software improves over time, then you accept that it changes over time. If it's changing, then there will be situations that will behave differently in the future. The implicit assumption is "the software will only make better driving decisions with each point release", but that doesn't follow! There's no proof that a situation that was driven safely by version 1.1 will also be driven safely by version 1.2 (unless it was tested in simulation).

If this means the pace of self-driving development would slow down, then so be it. I wouldn't let a driver turn on Autopilot with me in it.