Our house does look a little like those, in that we have 3 and a half floor to ceiling bookcases. We have books in the study (business books, books we've written or co-authored, poetry books, foreign language books).
We like books though, and don't think of them as clutter, but as decoration and as memory. You never know when you'll want to reread a book and it's pretty hard to browse through a Kindle book. Graphic novels and poetry don't translate very well to e-books, nor books with many illustrations or maps, and we have a lot of those. Academic texts too are easier in hard copy so you can annotate them physically, though I know you can highlight on Kindle.
I also read on Kindle and listen to audiobooks, so we've acquired far fewer books in the last 15 years or so, and have donated lots of books we'll never read again.
I don't mind things being mismatched and I prefer having stuff I want around me to the idea of keeping things clean. I mean, nothing is actively dirty, but books do get a bit dusty and need dusting from time to time.