Well, I don't want any books being wrong, but I don't see why the manual has to include everything and leave it out of books. They should make the experience more interesting and teach you about the world.
But that is what the books already do.
The majority of lore in TES games is in the books. Its like a whole deeper layer of immersion, totally optional.
Read some discussions on the lore section, if you have always just played the game and ignored the books it will be boggling.
The books in the games have always provided a fun distraction, there are novels, history books, books on religion etc, it is what gives the world a great deal of its depth.
I think having books be of a direct relevance to the player would break the fourth wall, make you realise that this world is there just for you, instead of providing verisimilitude.
I suppose in the end I wouldnt mind much, but only as long as it doesnt mean it reduces the number of books about lore.