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In my opinion, computer-controlled opponents already introduce an additional imbalance into the game (some players use computer-controlled heroes to set up a strong melee unit with 1000 attack, build a Citadel, and leave the city empty, while others have a Celestial unit sitting in a Castle with 5 skill points and a full purchase of items, etc.). If computer-controlled opponents are made even smarter, it will result in an extremely casual experience, suitable only for single-player mode. In tournaments, it would be pointless to play with strategies that rely on computer-controlled heroes.