Regardless of the cost and capacity analysis, it's just hard to fight the industry trends. The benefits of "just don't think about hardware" are real. I think there is a school of thought that capex should be avoided at all costs (and server hardware is expensive up front). And above all, if an AWS region goes down, it doesn't seem like your org's fault, but if your bespoke private hosting arrangement goes down, then that kinda does seem like your org's fault.
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