Why I love NixOS is really about the Nix package manager, reproducibility, and sane system management in the LLM coding era.

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A developer explains why NixOS appeals to them, focusing on the Nix package manager's core value: deterministic, reproducible, declarative system management. Key benefits covered include defining an entire OS configuration in one place, safe experimentation via isolated shells, cross-platform use on macOS and Linux, and stable upgrades without system drift. A notable section highlights how Nix pairs well with LLM coding agents — agents can use `nix shell` or `nix develop` to pull exact tool versions into isolated environments without mutating the host system. The author also touches on using `flake.nix` to capture reproducible builds and `dockerTools.buildLayeredImage` for deterministic container images, positioning Nix as a unified model across laptop, CI, and deployment.