Or. "Safari links have been corrected" "Spotlight now searched music correctly" so folks can specifically test those areas to see if in fact it was fixed. Whats the difference in them providing a changelog upon release? Most end users probably dont even read those. Only us tech folks even care. Seems it would be more important to supply testers with that information than the general end user.
While it's good to know the content of a release, and what fixes may be present, beta testing is (by design) a window of regression testing alongside normal (possibly targeted) usage to garner an idea of stability. In Apples case, there are literally millions of different configurations of device because of apps and how we use them and how they all integrate with each other. This is an unfathomable internal task, full of known unknowns. Even storage has an affect on how everything behaves so being able to tap into a market where these thousands of variables are potentially covered is a very clever way of providing some peace of mind style stability reporting and gathering real usage stats rather than mocked ones is always more beneficial.
If this was focused on new features and fixes we'd be testing in sprint with Dev's or on Alpha code not yet deemed ready for wider consumption.
These betas are considered good enough to use by anyone who wants a go, new feature testing is already complete (and likely) had full automated regression suites and performance tests etc etc run against it, the point is it's not just for techies but for enthusiasts as well (who in all likely hood can raise a decent bug or feature request or observation).
If you want a changelog, wait for the release or later betas, else do what needs to be done... Use your device like normal and highlight anything and everything that seems odd or off or damn well broken
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