Replace "books" with "sustained reading for entertainment" and it's more clear what's meant. Reading a summary or occasional chapter isn't the same thing, nor is reading technical literature.

Note that this isn't an oblique way to frame your preferences as bad. They're simply a different kind of activity, like how writing commit messages is a different activity than writing a novel. There are different activities even within this definition of "reading". I primarily consume new books. My spouse usually re-reads old ones. One of us is better equipped for literary analysis while the other is better equipped for relatable conversations with normal people, but neither is a more "correct" way to read.