Let's leave github out of the discussion. That's a completely different beast. (And funny enough, github does provide 'go to definition' for some languages.)
So my point was that git is obviously useful for source code of programs.
And as you point out, git does not provide 'go to definition' for source code of programs.
Hence I suggest that the inability of git to provide cross-references in legal text is about as relevant (or rather irrelevant) to the discussion at hand as git's inability to provide cross-references is source code.
Does this make sense?
