Their tooling is built around CVS. Porting it to git would be a pain. Plus, git is bad at the "mono-repo" approach to development that the BSDs take; especiall

Their tooling is built around CVS. Porting it to git would be a pain. Plus, git is bad at the "mono-repo" approach to development that the BSDs take; especially when pulling changes from other sources. CVS has facilities to make this easier. The same reasons that Arch Linux is on SVN (stand-alone "projects" like pacman or netctl are in git, but the ABS itself is in SVN).