If you read Irene Vallejo’s Papyrus (don’t worry, it’s an academic!), you’ll learn that books did not (only) originate as a way to preserve knowledge. Sometimes, knowledge is boring. And we’re not even talking about fiction yet.
There’s a lot of crap out there. That statement is true beyond the context of books. Sifting and decision-making while buying is up to you. To ignore everything but academic authors when it comes to non-fiction is just ridiculous.