It was a selling point. Maybe even intended selling point. But it absolutely isn't the main selling point. Never was, never will. The big thing, the reason people ever started talking about Git outside Linux dev team, has always been branches. It's branches, not distribution, that made every SVN user in the world abandon it in exchange for Git. Saying distribution has been more important than branching is like saying automobiles replaced horses because of smell. Which, admittedly, was a big problem with horses, but come on.