I dread the idea of going to war with AI knowing that unless at least 2 are on your good side, the rest will be dragged in against you.
I get that we're supposed to try to make friends with as many of them as possible to avoid the liability, but in the current state of diplomacy, where allies conveniently press their new friends to fight against you, it makes the prospect of engagement with them tedious and distracting.
Even if this is something that may not be easily corrected, my only other grievance related to war is 'fixing the state of things' by returning conquered settlements to neighbors who lost them to the local bully.