The point behind the XKCD is that competing standards cause interoperability problems. I would argue, as does the original post, that Nix solves interoperability problems rather than creating them—it is a tool that helps you get stuff done, not a standard that purports to tell other people how they need to do things so you can get stuff done. But I’m not sure whom I’d be arguing this with, since a link to an XKCD does not constitute an argument to begin with.