Now, they justify this abstraction by noting that in practice most people treat mundane goods in much the same way most of the time. If you need torches, food, and so forth, you acquire it with a handwave from some abstract equivalent of a large general supply store (Wal-Medieval?). And, to a large extent this is true. But, what some others of us are trying to suggest is that while its probably a perfectly reasonable assumption to assume that mundane things appropriate to a setting are available in a large town, the same assumption is not necessarily true of any given setting with regards to things which are by definition not-mundane.