Rowling’s handwave was that, due to (iirc) worry over being discovered, they only took out the Map when they needed to scope out areas for their pranks, and then they always focused on the areas in question. They apparently never felt the need to use the Map to actually spy on anyone, and never bothered to look beyond what was needed for a prank. According to Rowling.
Rowling’s handwave was that, due to (iirc) worry over being discovered, they only took out the Map when they needed to scope out areas for their pranks, and then they always focused on the areas in question. They apparently never felt the need to use the Map to actually spy on anyone, and never bothered to look beyond what was needed for a prank. According to Rowling.