Yeah, the AI runs into problems where there are dead ends in the upgrade path:
Swordsmen
Longbowmen
Cavalry
Frigates
Ironclads
You will see many of these units around far past their age of usefulness. But any other lack of upgrading is all about the lack of cash. The AI will spend as much as it can afford to trade for resources, luxuries, and tech, while researching as well. The result is often that they have no available cash reserve. This limits their ability to upgrade, and is why you will often find AI cities defended by 1 top-notch defender, with one or more outdated ones underneath.
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Bloody Baro,
I assume from your post that you were playing on a low difficulty setting, perhaps without the most recent patch (v. 1.21). You may find that the AI can put up a much better fight once the odds are even (Regent), or tilted in the AI's favor (Monarch, Emperor, Diety). It's not that it is coded to be "smarter" on those levels, it's that it operates with penalties to commerce and production on chieftain and warlord, and that limits what it can do.
-Arrian
Swordsmen
Longbowmen
Cavalry
Frigates
Ironclads
You will see many of these units around far past their age of usefulness. But any other lack of upgrading is all about the lack of cash. The AI will spend as much as it can afford to trade for resources, luxuries, and tech, while researching as well. The result is often that they have no available cash reserve. This limits their ability to upgrade, and is why you will often find AI cities defended by 1 top-notch defender, with one or more outdated ones underneath.
------------------------------
Bloody Baro,
I assume from your post that you were playing on a low difficulty setting, perhaps without the most recent patch (v. 1.21). You may find that the AI can put up a much better fight once the odds are even (Regent), or tilted in the AI's favor (Monarch, Emperor, Diety). It's not that it is coded to be "smarter" on those levels, it's that it operates with penalties to commerce and production on chieftain and warlord, and that limits what it can do.
-Arrian
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