The BS jobs hypothesis, popularized by David Graeber, is IMO quite flawed. It's a way to look at the world without having to get your mind dirty understanding how stuff actually works. Sometimes that can be a good stepping stone to asking "just why are we doing it this way?". However, the broader observation that Graeber makes (essentially: "everybody, especially the people doing them, know it is bullshit") points instead to the disconnect people experience between the work being done by <their organization> and the actual stuff that they do. No doubt there are some true BS jobs, but I think far less of them than is often supposed. You and/or the person doing them may not see why they are there (and that is a problem), but that doesn't make them BS.