I understand that, but as I mentioned above. I don't think they are really going to get that much diagnostic information from beta testers in 4 days of usage before its released. If there is a problem and by time they start reading those problems, it could already be released to the public.
But the other side of that coin is that the last 3 betas have had the same exact release notes, so its hard to even know when we got the diagnostic tool. For all we know we got it in beta 5, they just never mentioned anything until earlier this week. I wish Apple was more transparent of whats going on with these builds.