At least with a controlled circle of people who respect that, say, handing off a doc to an editor means they shouldn't make inline changes any longer, collaborative doc editing like Google Docs.
As the above implies, you don't have great version control and some of the process management is manual. But it works well for people accustomed to working that way and it's much more familiar for people who don't regularly use git (or use it at all).
Is there really something better? Git is pretty great in general, and prose doesn't seem like there'd be much room for improvement in tooling. I'm not a writer really though, so maybe I'm missing something?