The approach of this experiment is interesting. But, as an experienced git user, I think it does not include easy access to very powerful and easy-to-learn features of git like "git * -p" which bring some interactivity in git commands.
"Gitless is an experiment to see what happens if you put a simple veneer on an app that changes the underlying concepts. Because Gitless is implemented on top of Git (could be considered what Git pros call a "porcelain" of Git), you can always fall back on Git."