Yep, this totally signifies a hint that we should abandon all grouping, and resort to overland questing or waiting in stealth for some unsuspecting noob to ride by so we can ruthlessly gank them off their horse and slaughter them.
I'm also sure there are a few bombers with a mission straight from ZOS to destroy those large groups who cluster around the flags without paying attention to their surroundings. That'll teach them to spread out!
That would be because ball groups are a huge problem. They hurt both the player experience and the server performance.
Also what buff to nightblade?