I have a very similar perspective as you. Most non fiction books, being focused around a reasonably simple concept, could really be explained in a blog post (e.g. any Malcolm Gladwell book, zero to one by Thiel, Super Intelligence). By simple, I mean as opposed to complex, not necessarily easy to understand or unimportant. The main reason, I believe, for these to be books rather than posts is to examine that same concept from many vantage points to allow it to "stick". For these books, I feel like I can usually get most of the value by reading the first few chapters or many even a summary.
That being said, if you look for books on more complex topics, you find things that can't be put into a blog post (e.g. WWII, biographies, technical topics). These are things where each chapter really does bring something new. The flip side is that they're hard to read; nothing in chapter 1-n will really help you in reading chapter n+1.
That being said, if you look for books on more complex topics, you find things that can't be put into a blog post (e.g. WWII, biographies, technical topics). These are things where each chapter really does bring something new. The flip side is that they're hard to read; nothing in chapter 1-n will really help you in reading chapter n+1.