The books are not the problem, their users are. If one takes an exam in Law and brings the relevant books with him, it's a pretty sure bet he or she won't pass the exam when the books were not studied beforehand.
Peg, I expect partner to bid 3♥ holding 4 not mediocre hearts and values to accept my invite. I don't want to play in game if partner hold a hand to weak to accept the invite. Playing matchpoints would give me more to think about.