I think Tesla has made the correct decision not to release the level of detail you are requesting. That is because end users (all of us here) do not do quantitative testing of Auto Pilot. We all just report our subjective seat-of-the-pants impressions which can be widely different responses to the exact same software.
Tesla does quantitative testing to gather hard data about Auto Pilot performance before releasing updates. These updates are then subjectively evaluated by end users in a huge number of unique situations and Tesla cannot possibly test in advance for all of those situations. End users will inevitably experience system shortcomings and failures. That is why end users have to stay alert to surrounding conditions and keep their hands on the wheel, as Tesla strongly recommends.
All that said, it seems clear that currently Tesla has the best driver assist features on the market. To those who say that Auto Pilot is "dangerous" or "unsafe", my response is "Then don't use it and wait for it to improve because the last two years have shown that it does improve over time".