I completely disagree with this – an unpredictable enemy is, in my opinion, better than one that is pre-programmed to follow a specific behavior pattern.
In general, if you look at the original ToE, there were times when, after defeating a strong neutral creature guarding some relic, the AI would, instead of taking the prize, pick up a bunch of resources or a chest, which clearly only supplemented the main treasure – that is, it gives the impression that this battle was only for gaining experience, because why defeat a strong neutral creature without taking what it was guarding?
Another well-known problem with the AI is its attitude towards the "Evasion" spell and mass versions of spells – if the AI is so stupid and this is irreparable, then you could try to program specific perks for it that it will/will not take, because there are clearly strong and clearly weak perks, and even with strong perks, the AI sometimes doesn't know how to use them – in my opinion, only passive abilities will be played out in a game with the AI (that is, improving combat skills, machinery, and logistics), and from magic, perhaps only chaos or darkness, and even then not always – these are not passives, and the AI may start to act stupidly.

In EE, I think you can choose in the bonuses before the start of the map what the AI will be (defensive or attacking).