All of the AI's behavior is player-centric, and very often nothing of interest happens in the Fog of War. If you're a horde, the AI will send armies across desolate territory to fight you for no gain at all. I've seen players get declarations of war from minor factions with enemy armies on their doorstep, and nothing to gain. The Campaign AI is utterly HOI4-tier retarded and is designed from the ground up to be superficially challenging, declaring war on the player even when in other wars. It is impossible to keep up with the amount of agent spam the AI unleashes on you because even on the easiest difficulty, they get bonuses. They spawn with top-tier agents and will invariably send agents across the entire map to harrass you, slowing your armies down, wasting turns and wasting your IRL time. The agents are chance-based and the AI gets ridiculous bonuses to their success chances. Agents have never been good in Total war, but in Attila they are able to perform infuriating actions against the player every single turn, with no way for the army to react without using agents themselves. I could talk about everything wrong with TW Attila for 5 hours. Here are some of the worst, but there are literally thousands of them. I am stunned that so many players aren't driven to insanity dealing with them. Rome 2 has some annoying, contradictory mechanics (as do all the total war games) but Attila inherets those and takes them to an obscene level. There are just far too many things which are absolutely impossible to ignore in Attila.

Hoi4 roma invicta mod