Exactly. I think, in contrast to chess or go, Starcraft is not only a "mind game", but also requires physical agility and precision for command outputs. Those Starcraft top players all have had wrist injuries and so forth [1].

If the AIs were to become strong enough to compete against Starcraft players, they would have the unfair advantage of being able to give a lot more actions per second.

[1] https://www.reddit.com/r/starcraft/comments/16mkmg/injuries_...