The current state of monolith experience books is the pretty much do nothing, its a barely noticeable bump on the xp bar, even at lower levels.
Maybe this was done to prevent power leveling or something? I dunno?
Lets change the books from giving experience, to giving skill levels.
If a person is trying to re-level a skill for some reason, they can do monoliths for the books, and accelerate skill re-leveling.