Well, Jon, if you'll take a close look you'll see that there has been a concerted effort to build upgrade scripts for all changes that have been made for 4.6.2. Your note implies that the need for upgrade scripts isn't being taken seriously and that you're the only person involved with the OpenACS effort who understands the need for upgrade scripts. This is incorrect. If you were right various people involved in the 4.6.2 effort would not have spent hours writing and testing upgrade scripts.
Obviously this one got missed. People can help ensure that our final releases include all necessary upgrade scripts IF THEY'LL HELP US BY TESTING when we release our betas.
From one point of view there's never any excuse for any bug, i.e. we should all be perfect at all times. Unfortunately people aren't perfect, we will have bugs, and while it is true that testing won't prove the absence of bugs it sure helps us find them.