There are some aspects of maps - for example, edges, blank spots, and so on, that seem, if not necessary, extremely convenient to keep as part of the map. However, if you use these features of a map in the same way that you use most features of a map - to guide your actions - then you will not be guided well. There's something in the sequences like "the world is not mysterious" about people falling into the error of moving from blank/cloudy spots on the map to "inherently blank/cloudy" parts of the world.

The slogan "the map is not the territory" might encourage focusing on the delicate corrections necessary to act upon SOME aspects of one's representation of the world, but not act on other aspects which are actually intrinsic to the representation.