i agree, as a designer/front-end dev, that uses github, git versioning works on css (~ my tone doesnt translate to text) etc, so yeah there is a breakdown when asking designers to use git, but to be honest i manage fine, so i dont see why others cant do the same :)
implying i said they wouldn't be valuable...
I am a designer and git is not coding, its merely about learning a tool that helps with collaboration, git/github being one of many. :)
i think we're on the same page. i can imagine that "GitHub for Mac" etc, might end up helping those designers that feel git is an unfathomable entity...