I think it boils down to difficult to quantify factors: most notably, love. In spite of all of git's warts (or perhaps even because of them), it's very clear

I think it boils down to difficult to quantify factors: most notably, love. In spite of all of git's warts (or perhaps even because of them), it's very clear that git is a tool that was created by the people who would be stuck using it. I'm not saying that isn't true about the other ones. I'm just saying it just doesn't shine through as much.