I don't doubt your knowledge of PCs, however from what I've seen you base everything on what you personally need, and on that account I am the same. For my Personal PC, I don't mind it being updated, I like everything to be updated, and any bugs that arise I will "try" to fix myself, or wait until another update comes a long. So I agree with you there.
However, I have seen it from a business point of view as well. My dad is currently working on rolling out Windows Vista worldwide for the FCO, and is also involved with the admins of the network. So both he and I know what we are talking about on this subject. It may be unlikely, it may not, but the fact that there is a CHANCE, is bad enough.