I hold that the world building in a novel or movie or show should stand on its own well enough for people to be content if that’s all they have, but I also have it on good authority (well, the internet, anyway) that people like more in-depth looks from time to time.
With the world of the Doomwalker and the rest of the Paladin trilogy, I’ve got you covered. I know the world of the Holdings very well. I know it in ways that have nothing to do with the story of the trilogy. But those ways are interesting, I think.