Why...because the level of complexity is not even comparable, in any sense.
You simply can't compare the level of diplomatic programming in ETW to STW. It's not even close.
Likewise, the Strategic AI or Battle AI are worlds apart now from what they were in STW or MTW.
Therefore to say that STW Strategic AI is the same as ETW Strategic AI and therefore now we can begin to compare is absolutely not possible.
Please note I'm never going to reference eye candy i.e. graphics in this discussion, even though battle mechanics are again technically poles apart when you compare STW as 2D sprites with 3D animation.
In relation to your comment I think it would be more accurate to say that the development and progression we have seen from STW to ETW in complexity has not been mirrored by an AI that has followed the same level of development.
What difficulty are you playing on?
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