Each update brings with it a fixed cost/overhead of re-validating your system/workflow. Doesn't matter if there are 1000 changes or just 10 -- you still have to pay that fixed cost, re-integrate, and test.
Exactly right. One of the systems I work with is used for regulated work, and we have to re-validate the system for almost any update. It's a pain even for the limited validation we can use if the update "shouldn't" affect our key application, and not just because it keeps our system out of production until we can finish the validation. We would never update our OS at all if our IT Security people let us get away with it. Our application software normally only gets updated when we replace the computer hardware, which would require a much more extensive validation anyway. In theory we might update earlier if the new version had some killer feature that would justify the pain of a full validation, but I don't remember that ever happening.
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