yeah, i guess it boils down to do you want. a simulated human AI using human economics, CPU AI adapted to work as an allied player using CPU economics, or create a hybrid if the two (simulated Mechanics that look human with human type resource buildings strewn around but really aren't), or something different all together?
I'm guessing for the simplest coding that it would be a CPU AI adapted to look like a human economy, the mechanics don't really have to work, it just has to seem reasonable to the human players right X?
but there will be differences since a true human economy AI would have to be coded from scratch and I think X wants it as easy to do as possible and still be fun. so creating an "android" race of independently thinking, human sympathetic synthetics lets you argue away those inconsistencies without having to worry about fixing them. They sorta seem to do things the "human" way but also seem to do things the "AI" way......
Personally i don't care either way, if there is an allied AI or not. It's not that important to me personally. yes i can see it adding something to the game, especially those playing single player games. but it definitely sounds like an expansion thing to me.