I use NixOS and Flatpak (Nix-Flatpak) to install software that is not available in Nixpkgs. Unlike Arch’s AUR, Nixpkgs has fewer popular packages. However, Nixpkgs beats AUR in terms of quantity because many Nixpkgs packages are redundant.

• Setup new user to sudo

I hope it is not a passwordless sudo, it is basically the same as root.

If you are beginner in Linux, try beginner-friendly Arch-based distro: EndeavourOS, CachyOS, Manjaro

You can learn Arch without too much hassle while using one of them