Cool Backstory Syndrome

[Anaraxes]

note that most players will read the GM section anyway

Enforcement isn't my goal. These players would buy both books even if you physically split it.

With the usual intermixed text, it's impossible to avoid the spoilers even if you try. So, sure, you can read everything and then pretend you don't know all the surprises already, but that's just plain less fun. Or you can not read anything at all and be utterly clueless about the world and your character, which is even less fun.

Game authors should be aware that they're writing for a game, not writing a milieu novel, and help make it fun for everyone, not just the GMs.