Point 5 (not 4) doesn't mean that the AI should never get bonuses. I mean that before it gets bonuses there should be a setting in which it has the maximum tactical/strategic capabilities. One setting higher and it gets bonuses.
In M:TW, you had medium in which the AI was not optimal. At hard it was at its best but there were no bonuses. At very hard it would get bonuses for the ultimate challenge.
I have my doubts that in R:TW that the AI is already at its best in medium (taking the method M:TW into consideration). So I guess that is at hard. However at that difficulty the AI already starts to get bonuses; phalanxes are no longer capable of properly holding a cavalry charge. I believe that Red Harvest did some tests and the AI was clearly having bonuses at hard.
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