Why do you bring this up?
For what it's worth my impression is that while there exist people who have genuinely benefited from the book; a very large majority of the interest expressed in the book is almost purely signaling.
It would be easier to discuss the merits (or lack) of the book if you specify something about the book you believe lacks merit. The opinion that the book is overly hyped is a common criticism, but is too vague to be refuted.
It was a bestseller. Of course many of those people who bought it are silly.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
(I plan to make these threads from now on. Downvote if you disapprove. If I miss one, feel free to do it yourself.)