I recently have been working on making battlemaps from some of the real old 1st Ed AD&D Modules for a client. It has been fun, but it is also very frustrating at times when the written description does not come close to matching the map (my guess is that the cartographer and author were not communicating at all ) A typical example: the room is described as having 4 beds 2 bureaus and 2 desks with chairs and the original blue grid map shows a 9' x 9' room with 1 bed and a chair. Or the opposite might be shown where the mapper drew a 9' x 9' room with all 4 beds, desks, chairs and bureaus in the room, but they are drawn hobbit size so they fit when clearly they are being used by humans.

So my point is this, not only are maps important, the accuracy of those maps is also critical.