Any sufficiently complicated package manager and build system contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of #Nix.

Unfortunately, saying that gives the impression that Nix is somehow comparable in elegance to Lisp. I’m sure I would come to believe this if I used Lisp as much as I used Nix. But in the meantime I need to point out that Nix is itself ad hoc, informally-specified, bug-ridden, and slow.

NOTE: Apparently this is a bit too obtuse. This is a reference to Greenspun’s tenth rule, which says "Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp.". And what I meant by "[…] I would […] believe [Nix is comparable to Lisp] If I used Lisp [more]", I meant that that would happen because I’d start liking Lisp less.