I'm not sure you can say they want EVERY book to be different. Green Lantern for example has had no discernible changes in it's timeline. Green Lantern #1 picks up right where the previous run left off, but I guess that's part of Geoff's purview as chief

Well, maybe because I most certainly did NOT say every book.

“The point is, with a couple exceptions, DC is trying to clearly differentiate between the two different timelines.”

Also, Batman’s history is more changed than people think.