Subjects should have some sort of modifier that happens when their overlords bring them into a difficult war. I was called into a war with Castile against Tunis and the Ottomans. Ottomans had completely wrecked Castile Junior partner Naples, I mean they took every one of their provinces, 40 devastation in some places, 20 war exhaustion.
This should cause a lot of animosity for them towards Castile. I know that they aren't in any position to declare Independence after they get weakened to that state, but the malus should start after they have recovered economically and manpower wise and should be way harder to integrate in the future.
This should cause a lot of animosity for them towards Castile. I know that they aren't in any position to declare Independence after they get weakened to that state, but the malus should start after they have recovered economically and manpower wise and should be way harder to integrate in the future.