This fight sequence Wolfie did is proof enough that combat AI needs A LOT more revision. The AI is blindly walking into barrels, not knowing what to do when you position your fighters on the high ground, the mere fact that you can essentially beat all three bosses and their minions at once with effectively 3 members in your party should be enough reasoning. Yes, Wolfheart has gone through every nook and cranny of this game and is a very good player but he even admits that hes abusing the Hide mechanic while on the high ground. I understand that its a cheese way to do this and that most of the playerbase will never think of even trying this but the barrels are overpowered and the fact that the AI can't do nothing about them makes them even more broken. This should not be possible to do (with relative ease), even if most of the minions are Levels 1 and 2, the sheer number of them should make this fight way harder. Dror Ragzlin did nothing. Priestess Gut swallowed a big barrel and did nothing. Minthara survived for as long only because of Mirror Image.
Its worrying, to say the least. ((this is not to trash on WolfheartFPS, only to prove a point regarding the combat AI and combat exploits, he is an amazing content creator and a wonderful addition to this community and you should really go check in on his streams if you aren't already!))
I mean this is hard work, a 54 minute video by an very experienced player using every possible thing he can think of to do it and still involves downs. In short it is not "possible to do with relative ease" - it requires a lot of tedious work. That's not to say that there are not issues with how the enemies react but the player is pushing things to the absolute limit to do this. It is not a walk in the park.