There seems to be a misconception forming here. Wilderlands is not just a random listing of random encounters. It is a very detailed list of locations which are connected together with subtle plot threads. For example, town X may produce a mineral F that is shipped to a city in hex Z, but a wizard from hex B is scheming to steal it. It's an integrated world without being a hyperdetailed setting like FR. But it has no metaplot, and for many people that's a good thing. There are hundreds of interesting little plot hooks interwoven like a fine carpet throughout the world, but you can ignore them without damaging the structure of the world. Ignoring metaplot and setting plots in FR, on the other hand, can have nonsensical results. That's hard for one GM to do unless they have a teenager's infinite amount of free time.
It's a skeleton framework that you flesh out, and that's fun. Many people don't have the time to build even a skeleton, but don't want a muscular package like the FR because it interferes with their own plans. Wilderlands fills that gap.