This is a good joke, but I do remember a course I took that required homework assignments in Mathematica. I definitely copied some of those from the help files. This was down to unimaginative assignments and fairly comprehensive examples in the docs. It even worked in exams, e.g. we were asked to compute and 3d plot a particular Lorenz attractor, this exact problem was in the (available in exam) help files.
It’s a difficult issue. If you write a calculator app as a web page, you might want to use the minus sign for the rendering to look typographically nice. But someone copying the output then might have trouble getting it working when pasting into some number input. A native app of course can convert to hyphen-minus on copying. But really, maybe it should become more common to accept the minus sign for minus in UI input.
