LLMs are getting very good at packaging software using Nix.

Then you're committing to maintaining a package for that software.

Like all LLM boosters, you've ignored the fact that the largest time sink in many kinds of software is not initial development, but perpetual maintenance.

This. I wouldn't have touched Nix when you needed someone who was really good at Nix to keep it working, but agents make it viable to use in a number of place.