This is off-topic, but I was thinking about this the other day - couldn't AI be used to balance a competitive game in this sense? Imagine that the AI becomes so good that human players very rarely win against the AI in a best of 7 series. Then we find out that AI doesn't ever build a specific unit. That would be a pretty strong indicator that said unit isn't good enough compared to the rest.
Based on the initial AlphaStar against TLO/Mana, you would think that Stalkers are insanely OP and the only thing worth building.
I (and others) have wondered that if you continue to lower AlphaStar's APM, you would see a diversity of units. The money would be in where AlphaStar decides to spend its really tight APM budget. Is it worth casting that Psionic Storm?
I personally feel like it has an insane micro advantage by being able to select arbitrary units on the battlefield, as opposed to dragged squares or control groups. But I'm not a pro gamer, so I don't know what that feels like.