I've found that ChatGPT makes outstanding summaries of famous self-help/non-fiction books. Particularly if you ask it to give you a 100 word summary of each chapter.
Many people write in this thread about summaries, but in my opinion, the book is more than that. What I'm searching in a book, besides relaxing and other stuff, is ideas. I always find interesting that most boring part of the a book introduce some great ideas, or advices. Like when you expect it at least, they appears - like finding your better half. If you try to search for a one, the chances are that you won't find one. They appears in some random hidden places. That's how I see books. There's always something hidden where you don't expect it. Also I read a book from cover to cover, for the reason I explained before.