@debrajray it is known that "lots of books" do not serve any meaningful room treatment purpose. Their absorption and diffusion are highly marginal, at best, and indeed only for the highest frequencies (shortest wavelengths).
That’s just wishful thinking on some people’s part.
I agree with some other responders that there’s no point in spending quite a lot of $$$ on an 8-series upgrade without having a very well sorted-out listening room, acoustically.
As least from a sound quality perspective. Now, if you want to do it for the purpose of feeling good about having their top-end unit, that’s another matter.