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)).
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.
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.