Books that just give information (especially techs) are replaced by the Internet.
Other books are supposed to teach me something,
but my experience is that I learn stuff by doing and thinking rather than reading.
On the claim that it’s all just information, consider that a book represents a substantial portion of the life of the author(s) and editor(s). Contrast that to the cheapness of publishing online.
This is why I'd never read a book to learn a framework or API. For me, reading is all about learning those core lessons that apply equally well across the decades (Code Complete was great for this).
Whenever I think about consuming information, I always first consider the half-life of that information (another reason why I rarely spend time keeping up on the news).
Maybe, but does the ideas, practices, and principle change often or at all for our profession? I find many old book still very relevant today, good books don't really age that fast.