I agree that discussing that distinction [ed: between needs and wants] can make sense. Since the book does not use the concept of needs as an abstract concepts (“what is a Need”) nor as research device (“What are your needs?”) I did not discuss it. Fittingly, if you Ctrl+F for "want" you will not find it being use as a research concept either (There are a lot of "wants" in regards to researcher activities as in "You want to do X after Y")