As I brush my shoulders with Nix, I am more convinced that its a solid platform to build Linux distros of future and today’s demands from system maintenance point of view. Nix the language is pretty solid and its functional approach is awesome, your whole system is an expression. I am going to give it a shot in a VM as I have installed NixOS with KDE/Plasma5 and its a breeze to get going. Maybe, I will mix my archlinux and Nixos experience. I know AUR is powerful and with Nixos I will have to give up some of that but its perhaps not a big deal. I think you can replace Ansilble if you start using NixOS for server loads.