There are git clients for perforce, hg, svn and so on[1]. Oak' developer (or the community) could always develop a git frontend for users who prefer that .

[1] https://git-scm.com/book/en/v2/Git-and-Other-Systems-Git-as-...

Totally agree. This is going to be the hardest dev tool to get people to switch, but we're trying! I think there's going to be many more players in this space in the next year or so. It'll be interesting to see what shakes out.