I guess that’s where the advantages come into play the most. I only use it for a handful of machines (2 notebooks, one workstation, an SBC and 2 VPSs) and it’s still a great solution, though there is quite the overhead for the first setup.

Anyhow, that doesn’t mean that it’s more work in total than other distributions. The module system catches a lot of configuration errors for you which means you basically never and up with a “broken” configuration, and even if you did, you could select an older generation (more correct way to say rolling back on NixOS). Sure, the configuration might not do want you intended, but it will most likely be functional.

This even goes so far that some modules detect common configuration pitfalls for applications, like headers not being inherited because they got redefined.