Software has variability spanning multiple orders of magnitude. In entertainment, you might get one or two extras fewer or more than you needed, but you won't suddenly stand there with a hundred or thousand times more extras than you needed. Similarly, equipment will be hours or days away from where it's supposed to be, but you won't suddenly find out it got dumped on another planet.
Why does software have such extreme orders-of-magnitude variability? Anyone's guess. I like the perspective that software is made out of many pieces of little software, which are in turn made of even more smaller pieces of software. That fractal nature is a qualitative difference to people, which are not made of many tiny people. (As far as I know.)