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Tyler's point is that most companies don't have anywhere near the computing scale and workforce size which Amazon and Google have. Most companies don't have any option other than to take services offline during certain types of maintenance.

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And why _exactly_ is that?

Why does the service need to be taken offline?

Because more instances costs more money and are more complex to orchestrate, costing even more money.

Most sites don't have the SLA or other reliability requirements that dictate crazy uptime. If they have no need, they won't structure their infrastructure for it because doing so is expensive. Big cloud companies have that figured out because their customers want it. Other, smaller sites feel that their money is better spent elsewhere.

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