Again I don't think that's a correct assessment, Guix actually does have some overlap with systemd because they decided to put some containerization things there. In Nix, this would be delegated to systemd.
I also wouldn't say that that runs contrary to the GuixSD philosophy, as there are a lot of packages in Guix that are written in C and C++ and other compiled languages, and I don't believe they plan to replace them. Maybe I'm wrong about that? At some point it might be interesting to have a Lisp/Scheme-only distro. Of course the kernel would still pose a problem there.
I also wouldn't say that that runs contrary to the GuixSD philosophy, as there are a lot of packages in Guix that are written in C and C++ and other compiled languages, and I don't believe they plan to replace them. Maybe I'm wrong about that? At some point it might be interesting to have a Lisp/Scheme-only distro. Of course the kernel would still pose a problem there.