In many other roles, bullshit can actually get you somewhere, especially if persuasion is part of the job.

In other situations it's not just bullshit but fraud, so we consider it another category.

Software itself is unforgiving of bullshit. If it's buggy as hell, you can't just talk your way out of it. It's also opaque enough that it's difficult to definitively distinguish between incompetence, bullshit, straight-up lying, and just failing at a difficult problem (if only because of insufficient resources). It takes a significant amount of work to make that kind of distinction and that work doesn't necessarily translate from project to project.