I'm sure it is a very fine book
by very fine journalists and I certainly don't object to it being published or object to people reading it, but there is a kind of "yes, you read a few tweets and watched one rally, too?" about all of these sorts of books. Yes the details matters and history demands they be recorded, but there's a bit of "new book says Trump is as bad as he obviously is" and people put on their shocked faces for a couple of days and then go back to covering him as "normal" every time one of these comes out.