Earlier quoted context omitted.
> searching for the cause of a bug let you discover multiple "forgotten" servers, ETL jobs, crons all interacting together. And no one knows why they do [..] And then comes the "beginner's" mistake. They don't seem to be doing anything. Let's remove them, what could possibly go wrong?
that's a management/cultural problem. if no one knows why it's there, the right answer is to remove it and see what breaks. If you're too afraid to do anything, for nebulous cultural reasons, you're paralyzed by fear and no one's operating with any efficiency. It hits different when it's the senior expert that everyone revere's that invented everything the company depends on that does it, vs a summer intern vs Elon M…
Move fast and break things is also a managerial/cultural problem in certain contexts.