While I find Zed's choice a good one -- GitHub (git) repos feeling more accessible, it pains me to think hg doesn't have as great a domination in this space. I feel Zed has a stronger affinity towards Python and the simplicity / extensions of Mercurial, which comes out in his post; it'd be great to have him more involved in that space.
But before we get into some "holy-war discussion" over VCSes, it's clear Zed just wants himself and his committers to get shit done.