I disagree. I think OP was just saying that sometimes you might need more than one book, given that the original audience had pre-existing knowledge that tended to fill in the gaps. This might appear to be unsuitability "for education" within a popular marketplace of "Learn X in 24 hours" books, and make no mistake that this is the marketplace that Shaw is going after, so it's really a quibble about the level of expertise of your target market. "Rubes can't learn C from K&R." Yeah, well they never have.