To the OP, I understand where you're coming from, although I don't really agree with the conclusions you draw from it. One other thing you need to consider though, is what most people refer to as the meta-game, and the discovery of new strategies, builds, and new uses for/combinations of units. For the game to be designed in complete symmetry, it is implied that the game designers know and understand entirely from the outset how the game will be played and all the different variations that can be achieved out of different playstyles and matchups. Yet even today people are innovating with new builds and the game is constantly evolving. It's a little too complex to simply achieve basic inverted symmetry, unless you want to make the game less diverse, and in my opinion, more boring.
Well, I'm going to say then that it should AT LEAST be symmetrical and utilize an inversion principle to some DEGREE.
I don't believe the game can just be thrown together with out adhering to some kind of philosophy.
Even the smallest donations help keep sc2sea running! All donations go towards helping our site run including our monthly server hosting fees and sc2sea sponsored community tournaments we host. Find out more here.