The campaigns set in this game world were, as the phrase "game world" implies, just games. That's all they were... just games. They were a bunch of people agreeing to play "let's pretend" in a make-believe world. As such, the one and only purpose for its existence was to provide fun for the GM and the players involved.
To that end, those things that make the best game play (and thus the best fun) always trumped trivialities like what the rules of the game say.