I think the real difference between Shogun/Medieval and the later games was the AI's awareness of the environment. The computer was able to recognize advantageous terrain and take advantage of it, and if you maneuvered to take that advantage away they would respond. From Rome on, the AI either stands its ground or advances straight towards you. It really has no concept of maneuver or of the significance of a hill, or a river, or a valley. And the "Art of War'-inspired AI is unlikely to affect this, since even if they do manage to internalize some of the Art's principles, it'll mostly affect strat map behavior.
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