It depends (and not any more than applications that need sneaky config). Simple systems can have quite simple options. At the very least you can take a working

It depends (and not any more than applications that need sneaky config). Simple systems can have quite simple options. At the very least you can take a working copy and figure out exactly which configuration is necessary. Hard to do that without NixOS. Especially with nixos-option. And the options are all documented in a central place. The module definitions using the options are also “easy” to search through (Language is a bit complicated, but not in a way that grep doesn’t work).