So I actually have a question about that... isn't it actually an upside? If you put the book on a damage dealer, you take longer to kill the enemies => you have more time to gain stats => you become way stronger
And in a boss fight you just remove the book and enjoy the carnage.
This person has discovered the forbidden tech :O .
But for real, yeah, it's a great strategy! Just be careful to not farm stats for too long during fights since the enemies start exponentially gaining POW the longer the fight goes on.