Maybe. Personally, I find the trope of the op artefact that falls into your hands, but gets mistaken for yet another trinket hilarious.
I don't have enough experience with Larian to gauge whether there will be consequences for mishandling the book. I don't personally want an out for every mistake I made, though. If Astarion has high enough approval, but ursurps his master, it's not like that's a /really/ bad ending. If the book route is a "secret ending", there wouldn't be warning flags, either. It's all just speculation, but I'm very suspicious given the mirror.
