Not just the authors. The editors, the designers, the people who do layout, and people who just never wrote a single line of code or typed a single command into a Unix shell in their life... all of them use git, and last I heard, they all have to learn how to use the CLI version of git.
It's nuts. Git is hard enough to learn for people who know the internals of how computers work. Making people who would rather be drawing artwork learn how to use git seems really crazy to me. Hearing the coping stories from non-technical people using git is very sad.
