Nobody "erased any walls." They played the map exactly how it was designed. There was no glitching, there were no bugs being exploited, they simply played on the map the way Bungie designed it. By your analogy, it's Bungie taking the maze after someone finished it within the existing lines and Bungie drawing NEW lines and saying "nope, you did it wrong". NO THEY DIDN'T DO IT WRONG! You're making analogies about people erasing walls, when Bungie literally drew new walls. That's quite humorous.