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>The failure modes of software are not as well understood, but are rarely life threatening.

Well, it's not life threatening, but what do you think will happen if every month your credit-card stops working for a few days because of a Windows/Linux regression?

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I appreciate the idea, but in that case, it's simply a cost/benefit analysis. The benefit of not losing a few days worth of fees on credit card transactions a month is worth way more than the relatively minimal cost of good QA, testing, change control, and rollback capabilities.

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