That you can use without having 4 PhDs. It's pretty good. You should try it sometime when your done fully ingesting algebraic topology theory or whatever the fuck Nix requires to know just to install figlet.
Try flox [0]. It's an imperative frontend for Nix that I've been using. I don't know how to use nix-shell/flakes or whatever it is they do now, but flox makes it easy to just install stuff.
You say that, but there seems be a vast chasm between “can solve LC hards” and “can administer an OS,” even though the latter is generally not at all abstract, extremely well-documented, and almost certainly has associated man pages.
[0]: https://flox.dev/