I use Nix extensively, but the Nix daemon doesn't do much of use that can't be achieved by building your code from a fixed OCI container with internet turned off. The latter is certainly more standard across the industry, and sadly a lot easier too. Nix is not a revolutionary containerisation technology, nor honestly a very good one.

The value in Nix comes from the package set, nixpkgs. What is revolutionary is how nixpgks builds a Linux distribution declaratively, and reproducibly, from source through purely functional expressions. However, nixpkgs is almost an entire universe unto itself, and it is generally incompatible with the way any other distribution would handle things, so it would be no use to Fedora, Debian, and others