Let's engage in a hypothetical...
A new product has been announced. It is a guide to a Kingdom setting. It has a beautiful region map, with dozens of points of interest, and the selling point is they are ALL detailed. Every town has a map and is brimming with premade locals. The various mountains, forests and other biomes come with proper random encounter tables and special encounters. Local monsters, tribes and other people are described. There are several fully stocked dungeons ready to use. There is detailed lore on the local history, nobility and religions. Each area comes with potential adventure hooks. Almost no area of this region is undescribed. You could run an entire campaign with what's in it and never have to create a single thing. The book is huge and reasonably priced, from a company you trust
Would you buy it? Why or why not?
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The reason I ask is to gauge how much value "blank space" is worth. Areas where the DM can go in and paint their own stamp without contradicting established lore. At what point, if any, does detail get in the way of creation. I get there is no one size fits all answer, but I'm looking for at what point does being through become a liability? Or does it not and there is an untapped market for a product that does all the world-building for the DM. After all, APs and setting guides do sell...