In my understanding, the Wolf scenario is a typical convention adventure, an introduction to the rules. You have less options here, and it gets straight to the point.
More options or examples or factions for sandbox gaming in the core is surely a good idea. As a game developer you can do this, or not. Depends how many pages you want to fill and how crunchy the book should get. But that’s personal taste and as mentioned above, I‘m happy as it is. But I‘m also a person, who wouldn’t complain if there would be too much crunch for my taste. In Alien for example I don‘t use like 50 percent of the stuff, cause I don’t need it. It’s still a great RPG, but do I really need that much content to play? TWD RPG here is more in my corner of text-art-crunch balance.