I mean, I sort of understand: I guess it's the kind of book which most people wouldn't read cover to cover, but rather dip into. So all those tables and indexes make sense.
What would make even more sense would be the same information contained in some medium not made of dead trees and weighing half a kilogram, in which you could somehow "click" or "tap" all those cross-references to jump from one place to another. If only such a format existed...