Reddit reviews Taylor Swift Official Reputation Hardback Book

While I understand your frustration, having an option to purchase all four books would negate the whole purpose of having four deluxe editions in the first place which is giving people incentive to get more than one copy and boost album sales. Which isn't anything new for her or other artists who are capable of selling physical CDs.

Also she might do the same thing she did for the reputation magazines and release a hardback book with all the content included in it a year or so after the album is released.