It's not just Nix lang it replaces, we use Scheme in place of a hodgepodge of languages (shell script, Nix, C and others). Almost all equivalents to C-hardcoded

It's not just Nix lang it replaces, we use Scheme in place of a hodgepodge of languages (shell script, Nix, C and others). Almost all equivalents to C-hardcoded parts of Nix is inspectable and modifiable in Guix. There's code reuse across the stack. Even the systemd substitute is opened up for inspection and modification. Nix glues a lot of black boxes; Guix is a single white box. Both approaches are practical for different reasons.