Stuff like this is nice because it does let one directly manipulate objects within a git repository easily with a few keystrokes, rather than having to type 'git exchange-frobnozz --quark-handler=positronium' constantly (or having a million aliases, each of which is useful right up until it needs to be modified slightly).
The disadvantage, of course, is that one really should still know how to use git competently at the command line for the 15% of tasks such wrappers aren't good at.