Why does /tg/ seem to think that, even with its reliance on very specific slats, and no custom "build what you want" supernaturals, CofD is in some way well suited for other settings?
CofD isn't even suited to run oWoD without homebrew, let alone buffy, or vampire chronicles, or True blood, or Anita Blake, or American vampire, or whatever other urban fantasy setting, published or homebrew, that you might be interested in running.
I mean, if you just want to run a mundane modern day humans campaign, it can do that just fine, but if you want a different variety of urban fantasy, it's just a terrible fit.