We could do the same thing with Git though, so clearly source control scheme is not strongly correlated with actual success of the project -- which makes sense.
The point was that there are a lot of git "wrappers" created to solve the problem of Git's usability. The same doesn't happen with Mercurial, and it isn't just because of a lack of use, as demonstrated by X, Y, Z prominent/large software companies/projects using it.
