I think that the AI is programmed to lose. Because the AI's (computer controlled factions) always attack at a certain point the player is forced to counter that attack. The AI attack usually end in failure which for them means end of game. Especially on H and VH campaigns the attack will drain their resources. A normal response of a player is counter attacking and take out the AI stacks. This leaves hardly defended cities/castles as a bait. Besides if you handle the pope well your AI opponent will be excommed.
An other point is that factions with one or two regions left ask to be destroyed because they (almost) never ask for a ceasefire to rebuild their strength.
An other AI strategy could be not to attack the player and let the player do the attacking. This will lead to worse diplomatic relations, a worse reputation and an angry pope. If the AI has some nice alliances the human player will have more trouble expanding than with a very aggressive AI.
To summarize: Aggressive AI means that a player is forced to expand, forced to destroy the AI player to take out the threat.
Defensive AI means more trouble expanding. Cities/Castle will be better defended etc.
PS In an other thread someone won the short campaign in five turns playing England. On amazing thing he did was buying Anger and Toulouse in exchange for an alliance and some money. I tried that in a long campaign and it worked. Also I have bought in a Milan campaign Bologna from the HRE for some florins. Trying to bribe these cities won't work but with a good diplomat you can get them almost for free. Need some improvement![]()
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