I'm not familiar with the author of this 'the world is not enough novel'. It could be an indie author or a work from a small publisher. Maybe it's a self - published book, which would make it even more difficult to determine the author without further research.
I'm not entirely sure as there could be various novels with this title. It might be about the concept that the world, in all its offerings, still doesn't fulfill a certain character or set of characters' desires. Maybe it's about a person constantly seeking more, whether it's power, love or knowledge, and finding that the world around them is lacking in some crucial aspect.
Maybe the developers focused more on the hunting mechanics. The story in Monster Hunter World might be designed as a backdrop rather than a central, heavily 'pressed' aspect. It could be to keep the focus on the exciting hunts and exploration.
Some stories in 'world enough and time fanfiction' could be about alternate universes. They might show how the characters' lives would be different if a certain event had occurred or not occurred. This can lead to really creative and unexpected plotlines.
One reason could be the simplicity of the plot. It doesn't have a lot of twists and turns like some other games. For example, it mainly revolves around the basic idea of hunting large monsters to protect the ecosystem or something similar.