One strength of nixpkgs that probably appeals to Arch users too is how much software is available and how easily you can just re-compile apps with custom patches. In fact, the latter is enabled exactly through reproducibility :)
That said, cool if pacman and AUR work for you, no need to change just for the sake of it!
That said, cool if pacman and AUR work for you, no need to change just for the sake of it!