Depends on what u want to do with it, I had the same config for a dedicated server at hetzner(nixos) , desktop, laptop with just a flag depending on the feature

Depends on what u want to do with it, I had the same config for a dedicated server at hetzner(nixos) , desktop, laptop with just a flag depending on the features I needed (server with xrdp, laptop with i3, desktop with KDE) U can replicate the system to anything, even build new config in a vm in seconds, or turn it to a USB stick, or iso, but u need to manually copy the home folder ofc It rather sounds as if u only read about Nix and not Nixos and the integrated ecosystem