Actually that's not true. While docker's reproducibility is based on an image snapshot of a state. Nix reproducibility is really just a recipe how to build it.

Actually that's not true. While docker's reproducibility is based on an image snapshot of a state. Nix reproducibility is really just a recipe how to build it. Because of that it's not really an issue. Yes, if you build a docker image through nix you have to regenerate it (which is easy) but that's how docker works.