Haha. I liked one of the answers further down in the thread - it points out that there is a cost associated with making your service smoothly upgradable, probab

Haha. I liked one of the answers further down in the thread - it points out that there is a cost associated with making your service smoothly upgradable, probably in both engineering time and in hardware. It's possible a lot of these companies are balancing this against the cost of just being offline for an hour or so, and making the rational choice.