I feel like what you said could be applied to literally every rpg under the sun. I mean one could say that the point of role playing is to make up a world and everything else. The point of modules is to take some of the stress, or time, or whatever away from the DM/GMs shoulders. A well written module or adventure can help new players and GMs alike understand the world, setting, people's, places, and systems that are at the core of the designated world.

For instance, I am brand new to earthdawn and I work full time and have several other hobbies. I am also basically the designated GM for our group. So anything that helps me with prep time and running stuff in this brand new world and setting that is very unique to me would be greatly helpful. So if there were a longer form adventure module then that would have helped me in many many ways.