Do the Game Guides add meaningful universe content

I’ve been beefing up my Halo shelf recently with the art books and the visual guides (and the encyclopedia) because I like having anything and everything that adds in some way to the universe. That said, I’m wondering how you guys feel about the game guides. Are they worth having in a little collection like that/are they relevant beyond just helping you in the game? Would like to know if I should bother before I go all out in emptying the piggy bank. Thanks in advance.