But do we really need them to determine balance?
Here is my 6pool allegory:
Lets say a hatchery, a drone, a queen and an extractor all cost 5000 minerals. Also lets assume that a 6pool always has a 50% chance of winning a game.
What would happen?
Every TvZ, the zerg player would do a 6pool. Overall TvZ statistics would be 50%. If that would be the only way to determine balance, would you say that TvZ is balanced?
Obviously not. What is really wrong here is the balance of the diversity. The 6pool strategy is balanced, but not the 7pool, not the hatch first builds, not the speedling builds.
Zerg players would claim that, but terran players would always point at the statistic and say "if you buff the drone now buy reducing its cost, zerg would be completely overpowered!!1"
No. It would give zerg another option, and then this option has to be balanced, too. And another option, more diversity, makes the game more watchable.
Today, I think the TvZ matchup is watchable, but the patch that changed the ghost completely removed it from the terran lategame army. Instead of balancing it, it was changed so that it is nearly useless, and that lowered the diversity of the game.
The matchup can still be "balanced" in a way that every other unit or strategy is fair, but the ghost is not balanced in my opinion. So we dont see ghosts in tvz now, that is no balance problem for the matchup, that is lower diversity.
In a perfect world, every unit would have its place in a game, everything would be balanced so that every strategy is viable. I would like to see patches and metagame go that way, to more diverse gameplay - that is balance in my opinion.
thanks for reading