I own a copy of Jim Arthur's book and find it fascinating every time I pick it up. I haven't picked it up in a long time, maybe 10 years or so and at the moment, I'm not even sure where it sits.
During my time as a golf course superintendent, I've been surprised and disappointed by how willing colleagues are to deride writings like Practical Greenkeeping for being, well, non-practical. This is something I've experienced with my own writings on turf management; colleagues saying, "well, that's great, but it doesn't work here." Of course this is true, but it doesn't mean the person doing the writing is wrong. The reader does bear some responsibility to cull out what is and what isn't relevant to one's particular situation. Alan's experience with the book is to me, a perfect example of how to consume any piece of information. What is relevant? What isn't? How can I learn from this?
As Alan stated earlier, there is much within Arthur's book that can be relevant to managing turf anywhere. I'm not sure it is the responsibility of the author to offer a caveat to each piece of information. Rather it is the reader who maintains responsibility for deciding what is and what is not relevant to them and their situation.