Obviously I already searched the web (not specifically HN I must admit) and there were always incredibly generic non-answers that ultimately say nothing (and they assume you have 3000$ per month or 2000 Mac Minis on your desk (hyperbole)).

Incredibly, one of the responses you got already is exactly one of those replies that says nothing. There's a whole bunch of words that don't actually answer the question.

I think you’ve got your answer, then. If nobody can tell you what it’s really used for, it likely doesn’t have any real use cases.