1. So many popular non-fiction books these days resolve around a single idea, which would fit in a blog post. But then, they're expanded with a lot of fluff. Personal stories, other stories, anecdotes, the author's motivation to do whatever. I tend to search for "$BOOKNAME summary" before even buying most books.
For example, recently I "read" 'On Intelligence'. It has many good ratings, but man, it is unnecessarily repetitive. You can easily only read chapter 6 and nothing else. Or only read the popular highlights from the Kindle edition and be done with it.
2. Reading all that stuff is still mostly entertainment. It might feel like learning something new, but 99% of it is forgotten anyways. Reading with the purpose of improving oneself requires action – to actually implement the given advice or knowledge. Obviously, you can't implement the advice from 50 books in a year. So why bother at all with all those books?
I read less, but try to be more serious about the content.