No doubt. But what the what the OP is trying to do is weasel away from a critique of the book by saying 'Well, it's really mostly about 37 signals. If you don't like it/doesn't work for you, well, that's just, like, your opinion, man'. I imagine you wrote the book with the notion that it is broadly (not universally) applicable, just like most books in the genre. And it's perfectly sensible to review it in those terms, just like this and all other reviews I've seen so far have.