With NixOS, you simply use Nix to configure a file that in turn configures other files that configure other packages, and you have to rely on the new path and v

With NixOS, you simply use Nix to configure a file that in turn configures other files that configure other packages, and you have to rely on the new path and variable definitions created by the maintainers of NixOS for upstream programs. So, you need to learn that if the program used A, in NixOS it's B -> A -> does the job (although it's not that simple). That's why, when you use NixOS, you feel like you're working twice as hard, while Arch Linux aims to be transparent by exposing the system structure without adding a ton of crap complexity like NixOS does.