There is a third reason. If he wanted to, he could store associated files with his issues. That use case makes more sense with a private repo, but it is something I plan to do with the repo I just created for my house.
Also, in a case where a piece of equipment needs to be replaced (like a range hood, or even a coffee maker)one can store digital copies of the user manuals in the repo and not worry about having to hunt the damn things down when the power goes out and you have to remember how to reset the clock.
Not that I've ever done that..