Reading the CA response that AI gets +4 attack bonus on H and +7 on VH, led me to think that the logical human player response should be missile dominated armies on harder difficulties. Basically, you do not want the AI to touch you in melee... Similarly, horse archer dominated armies, most probably, won't notice any any difference between the difficulty levels.
Also, now it is clear why AI cavalry just rolls over human spears/phalanxes on harder difficulties. Most spears appear to have max +4 anti-cavalry bonus whereas pike types: +6 anti-cavalry bonus. These bonuses get effectively canceled out by the AI cavalry's extra attack on harder difficulty levels.
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