No one is saying you should build this in your back office. My comment was limited (by the first bit) to people utilizing public clouds and those who run public

No one is saying you should build this in your back office. My comment was limited (by the first bit) to people utilizing public clouds and those who run public clouds. If you are, you are affected by these issues; if you are not, then there's an opportunity cost there, whether or not you believe the early optimization is greater or lesser.