Bloodletting? That's just too crazy for words. The OpenBSD people produce first class code that's solves real problems in real production, and you compare it to witchcraft?

If you absolutely need speak in parables, do it with something that represents an earlier common practice, for example with producing houses with hammers and nails instead of modern pre-fab concrete blocks. But even that is stretching it a bit too far, the productivity difference simply isn't comparable.