SC is not apsiring to be like a real world classic battle conflict, Sun Tzu art of war.
Game balance later in the game's life comes from new maps, map balance. Having a new set of maps can change the meta game how the game is played. The battlefield plays a big part. Its just not what you see when the big battle happens or when someone is dropping on someone from 3 different places. Brood War meta game changed because of maps.