I'm on the fence about this. For the longest time I'd have 100% agreed with you, but more recently realized that there is value in just having my mind be exposed to the subject for a prolonged amount of time. Sometimes the more interesting insights will be mine, rather than what the content of the book was. It also helps with retention. Of course some books just still aren't worth it. My canonical positive example would be Zen and the Art of Motorcycle Maintenance which is a very high bar and obvious example.
I’ve started to put more of an emphasis on “active” reading (for lack of a better word) in which I take what I’m reading and think it through for myself, rather than just passively accepting it.
It is certainly slower than passively reading, but the result is that I actually understand the subject much better.
You could read a dictionary definition of the word courage and vaguely understand it. You could read a full page with examples and understand it better. But when you read Socrates’ dialogue Laches on the meaning of courage, your understanding will be far deeper. Even if you don’t agree with the arguments made, the act of thinking through all of the arguments helps you understand what your own views really are.
Obviously most books aren’t written as Socratic dialogues, but if you take the arguments and stories that are presented throughout the book and actively think on each one, your understanding and retention will really improve.
And this is not to say there aren’t bad books and that many aren’t bloated. But providing you with the opportunity to think on a topic from many different angles through the use of different examples can be invaluable.