My understanding is that a micromanagement-based AI is likely not to be an "interesting" difficult AI to beat. The DeepMind project is aimed more towards (with its apm caps) at building something that makes good decisions (e.g., unit composition, build orders, crisis management) instead of relying on brute force optimal control of units. While it is likely possible to completely break the balance of the game with perfect unit control, playing against such an AI (which is really just a bot at this point) would get stale pretty quickly.