I'm not
@TwoSix, but here's my answer:
(1) Having to rely on the GM to tell me about the setting is not very immersive;
(2) Depending how it's done, it actually risks being tedious;
(3) It shifts the locus of play away from the player to the GM.
To elaborate on (3): the first time a friend of mine played in a GH-set game, he did some reading up on GH online. At one stage, the PCs were marooned in the Bright Desert. Drawing on his reading, the player said "Everyone knows that Suel nomads are thick as thieves in the Bright Desert", and then proceeded to try and find some nomads to help him (using the particular mechanic that the RPG we were playing permitted - in D&D it would be something like a Streetwise check).
If the player doesn't have that knowledge they can't confidently declare actions, and back to asking the GM to tell them what is possible for their character.
Ninja'd!