For the vast majority of simple sites a static nginx web directory is perfect. For anything more dynamic they'd be better off using a real setup and not some opaque javascript all-in-one binary full of unintentional (to the user who didn't explicitly set them up) attack surfaces.
The method you describe is fine but the average user will quickly run into a lack of features that are taken for granted with that approach, and if they then progress to something more "mainstream" it will probably be way more complicated than this.