Indeed you're right, I know what you're talking about, and actually briefly worked in contact with the people you're talking about in early 2000s as an intern,

Indeed you're right, I know what you're talking about, and actually briefly worked in contact with the people you're talking about in early 2000s as an intern, until leaving that circus for good. However I also know for a fact that it's been used in at least one organization for a couple live projects as a visual language in a CASE tool (no idea to what extent though). That org had some of the best bullshitters and practitioners of siburda - imitation of intense work - I've ever encountered in a post-soviet world (which had no shortage of those), and the same kind of ignoramuses you allude to.