I think the same for me. What I've gotten from books r.e. psychological issues are perspective and tools.
Perspective: sometimes a writer puts things in a way that illuminates or alters how I see my situation.
Tools: sometimes a writer has an idea or a scheme that I can put to practical use. The pomodoro timer on my desk has been handy even without adopting every aspect of the method. That came from a blog rather than a book, but same idea (to me.)
The great thing about books is that they not only provide knowledge, but can provide some course of action.
The book is both - an intro of "look how awesome you can be without the tech", a detox plan, and a plan to deliberately reintroduce helpful technology.
I am as guilty as anyone in that I have partly read the book, implemented a few of the suggestions, but haven't fully embraced. I think the holidays will be a great time to finish reading it and start my 30 day declutter.
I feel like i already know what i am doing wrong re tech addiction but that i think is psychological issue with me. Not sue what a book can tell me.