Well there's a reason for that - consider it a form of spaced-repetition learning.
The author's goal is to convey an idea to the reader. He breaks it up into small overlapping chunks and gradually doles out these small overlapping chunks over the course of the book, sometimes backtracking and repeating an idea with a different example, all accompanied by a compelling narrative.
If he does his job well then the reader doesn't notice that spaced-repetition learning is happening because the supporting examples are entertaining enough to continue reading. In the worst case, the author gets the exact criticism that you are leveling.
Honestly, if you had Mathematics books written like Thinking, Fast and Slow or Freakonomics you'd have a lot more students passing calculus.[1]
So, here's a challenge for you - in your area of expertise (whatever that is), write down the chapters of a hypothetical book you would write to explain one or two foundational principles to an outsider (to that area). It's pretty hard to do. Then compare with best-selling non-fiction aimed at outsiders like Freakonomics, etc.
I did this (chapter overview thing) and realised pretty quickly that I had planned a really boring book.
[1] I read Thinking, Fast and Slow around 2011, and I read The Mom Test last year. Almost all of the sub-themes of the former is still in my memory. The only thing I remember of The Mom Test is that people will lie to you to protect your feelings.
The author's goal is to convey an idea to the reader. He breaks it up into small overlapping chunks and gradually doles out these small overlapping chunks over the course of the book, sometimes backtracking and repeating an idea with a different example, all accompanied by a compelling narrative.
If he does his job well then the reader doesn't notice that spaced-repetition learning is happening because the supporting examples are entertaining enough to continue reading. In the worst case, the author gets the exact criticism that you are leveling.
Honestly, if you had Mathematics books written like Thinking, Fast and Slow or Freakonomics you'd have a lot more students passing calculus.[1]
So, here's a challenge for you - in your area of expertise (whatever that is), write down the chapters of a hypothetical book you would write to explain one or two foundational principles to an outsider (to that area). It's pretty hard to do. Then compare with best-selling non-fiction aimed at outsiders like Freakonomics, etc.
I did this (chapter overview thing) and realised pretty quickly that I had planned a really boring book.
[1] I read Thinking, Fast and Slow around 2011, and I read The Mom Test last year. Almost all of the sub-themes of the former is still in my memory. The only thing I remember of The Mom Test is that people will lie to you to protect your feelings.