[mturmon]

This is pretty much it.

It can be a lift to get non-computer-savvy folks to use a highly-managed system like ShareLatex (which is a great system). But it would be impossible (not merely difficult) to do so if "just use git for collaboration" is your message!

If a lot of your documents are collaborative, this turns out to be a major factor. (For my personal work, I'm happy to use Emacs and TeXshop and keep all files resident on my laptop.)