That was't he point of his metaphor, the point was about a massive step forward in technology. The full quote makes it clearer: "Subversion = Leeches. Mercuri

That was't he point of his metaphor, the point was about a massive step forward in technology. The full quote makes it clearer: "Subversion = Leeches. Mercurial and Git = Antibiotics. We have better technology now." (emphasis his).