Mhhh... the problem with only getting 1 copy of each is that there are only certain books/items in the game and what you suggested would make the game easier. Meaning if you are lucky you could have all important books after lvl 3 or so. Might be worth suggesting when there are more books (like lorebooks or more craftingbooks) in the game.
I mean we can debate if the game isnt already hard enough but still^^