check out deltachat, it’s an email client with an interface like an instant messaging app

NixOS has the potential to do really well here. The Nix language has a rich enough type system to generate GUI forms for every field, and there are several projects being worked on that allow editing NixOS options from a GUI. They’re still very janky, but it’s definitely possible to get to a point where a layperson could operate them without breaking their system.