This whole thing is another ridiculous argument.
Just buy the second goddamned book, you cheap bastards. And yes... also accept that you aren't going to use or want every single item on every single page of the book, and thus all of it is potential "wasted space".
I'm okay buying other books, but there is nothing wrong with improving effiency and reducing unneeded dupilcation. And I don't expect everything in books to be targeted to me, but I do expect that continually having to reprint stuff is not a good use of space. I don't think just anything not targeted to me is wasted space, but avoidable repetition and straight up lazy stuff like 17 pages of names certainly is.
Don't get me wrong, hind sight is 20/20, but these are lessons for 5.5e and 6e.