There was at one point a git interface. It was extremely cumbersome to use compared to the perforce/mercurial ones and was eventually deprecated. I can't speak

There was at one point a git interface. It was extremely cumbersome to use compared to the perforce/mercurial ones and was eventually deprecated. I can't speak to how much of that is staffing limitations versus underlying technical reasons for poor compatibility. At any rate, it's extremely simple to move to Mercurial from the git world, particularly with trunk-based development.