Git (and less popular competitors that are close in age and design principles, like Mercurial, Darcs and Fossil) is what everyone is using and therefore what ne

Git (and less popular competitors that are close in age and design principles, like Mercurial, Darcs and Fossil) is what everyone is using and therefore what needs compatibility, not an "old project" holding back progress. That role is filled by Subversion, CVS, VSS etc. with their tragic anti-features.