I've had a good run and I've beaten up my neighbouring AIs with my all-conquering knights of doom.

I can't do anything with them, however. I can capture some of their buildings (always offline for lack of resources), but anything pillaged by bandits or enemies remains pillaged forever and can't be conquered. The AI never repairs anything.

Capturing their capital only lasts for a turn before it flips back, unless I have soldiers camping out there. I can't use the capital for anything anyway.

Pillaging the capital gives me 100 gold, and it self-repairs after 2 turns. My glorious expansion has been financed by camping a hunter next to the Vandal capital and pillaging it every three turns like clockwork.

I don't mind the AI being a bit stupid, but it does nothing. No repairs. No migration. And because I can't conquer pillaged buildings and can't use the capital the AI empire just sits there like a coloured desert devoid of human life that hands out free money.

A simple partial fix would be to allow the conquest of pillaged structures and to not have the capitals auto-repair. Allow the zombie tribes to die out.

Or am I missing something?