I'm just wondering what makes you so angry about this? Sure, it may take away X amount of theme by not calling them books, but I think terms like build and deck are perfectly fine. Some people are really competitive about this game, where the theme isn't the most important thing to them. They call them decks because they are bundles of cards that have a coherent and forward strategy that strives towards a goal that win the game in their favor. Plus, it's a term they know and have used before. It's great that you love this game that much to get peeved about the wordage, though!
Cheers!!
Dude.