I work and worked for huge companies in the direct CIO team. Many times I thought "that is wasteful, we should do X". I self-host a lot at home and am a standa

I work and worked for huge companies in the direct CIO team. Many times I thought "that is wasteful, we should do X". I self-host a lot at home and am a standard nerd and what I learned over 30 years is that my knowledge does not scale at all. In such companies even if the DC is idle, knowing what happens when you switch it off does not exist. Even worse, when cutting/moving a service, three blocks down something crumbles and their custodian has no idea why (and worse: they would not even know that something was switched off if there is no strict change management). It is easier if you are a modern company that uses some modern best practices, there is at least hope that the configuration gives you a clue.