A good example for such a bloated book is "Clean Architecture" by Robert C. Martin. The ideas of the book are more or less completely explained in a single blog post or one of his talks (about 1 hour), but the book has a few hundred pages (432) where he delves into history and talks to you about how he used archaic computers 40 years ago (to render himself as a veteran and to underline some point in the main text).

Another book on the same topic (https://www.packtpub.com/product/get-your-hands-dirty-on-cle...) has only 156 pages and is far more useful in practice - but you'll learn less about the authors adventures in history.