The type of situation shouldn't occur, of course, but the real world, deadlines, oversights and so on mean that it can and does happen. It does demonstrate the complexity of testing when one has to consider a number of different variables and their permutations. The nuber of things to test can go sky high. At least BiaB and the plugin are unlikely to kill anyone. Anyone tried the same thing with RB? I suspect that's OK, but...
I have some sympathy with them, even though lots of the complexity is self-inflicted.
In addition to what you've said, Gordon, I'd also like to point out that the PG Music team worked tirelessly throughout beta testing. I honestly don't know when they got to sleep.
At the end of the day, everyone is human and being human means that there is always an "in hindsight" component to everything that is done. None of us see with absolute clarity until we look at things in review. That's why the lessons learned from debriefs are so important. Sometimes, for whatever reason, it is easy to overlook things (even things that some might think are obvious).
Just recently, a person on this forum asked about using the Juke Box with the MIDI Melodist. Most BIAB users have probably not engaged this option in the Melodist dialogue window. I knew where to find it, but it was the first time that I had used it. It turns out that in migrating the Melodist to the MultiPicker Library (MPL), something happened that stopped the Juke Box in the non-MPL window from working. I'm sure that PG Music didn't break this feature, nor leave it broken on purpose. It wasn't until this particular user, for whom the Juke Box feature in the Melodist is an important creative tool, tested it and discovered it wasn't working properly, that the problem was discovered. None of the beta testers, including me, discovered this even though a great deal of effort went into beta testing.
--Noel