Recently, I was talking to a college professor who was complaining about the multitude of ways in which Linux works on various distributions. He was complaining that one distribution of Linux put a particular file in one place, and another distribution put a file in another place. He said it was hard for him to remember where each distribution put each file.
If this were a “normal user,” I would have simply advised staying with one particular distribution instead of going from distro to distro, but in the professor’s case, he could not enjoy that luxury because his students were allowed to use different distributions. This type of inconsistency also affects systems administrators, and even regular users as they encounter different distributions of GNU/ Linux in various places.