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What? Have you used the old nix cli? It absolutely dominates Git in the frequency of "how do I do that again?" /s

Maybe take a look at Guix? (I don't use it, but it sounds like what you describe)

The neat thing about the functional design of Nix is that you don't have to reinvent the wheel: just make better steering.

Everything about Nix can be trivially refactored. Every part is neatly isolated from the rest.

> Everything about Nix can be trivially refactored. Every part is neatly isolated from the rest.

Tweaking a few NixOS modules it replacing a package is easy, but neither the Nix codebase nor Nixpkgs is characterized by perfect modularity or uniform layering.