This is exactly what is bad about LLM-driven AI: it is perfect for papering over the deep problems with unwieldy messes like nix. In a rational world, the pain and fragility of nix would keep it from getting mass adoption, until a deeply revised, and much more refined radicalization of purely functional software delivery appeared that had the upside without all the warts and inscrutable complexity. Instead, we'll just get a metastasized growth of incomprehensible nix configs, and be stuck in that local optimum for ever.
LLMs make worse is better even better, for the worse.