I think NixOS would stand to benefit a lot by taking inspiration from openSUSE’s YaST system configuration tool. I think that if NixOS had a well supported graphical interface for creating and managing the system config, it would become so much more accessible to a very wide range of users who never would have given it a try otherwise, which in turn would bring in tons of new users and developers who will want to improve nixpkgs, etc.
nixcon north america was sponsored by anduril https://nixos-users-against-mic-sponsorship.github.io/