In SS I never had a moral issue with my wars because my campaigns were usually fairly short and involved ensuring the safety of England "proper" or France "proper" etc.
In China that entire thought process has been hurled out of the window as China "proper" is almost the entire map but history and semi-legendary stories have informed us that people strongly identified with province or even country and the sense of ruling AUH is something that the player basically has to impose upon the other factions. It is difficult for me to conduct a war I can consider legitimate in these conditions.
Currently I have the Huai river as my southern boundary and control most of the North except for the realm of the Black Mountain bandits for which a struggle has been ensuing. I never once questioned "Why am I fighting this war?" in Europe but the question has been eating away at me since turn 1 as my goal had been to control the area roughly corresponding to the Jurchen Jin Dynasty rather than AUH but to do this the Heishan, Hebei, Yanzhou, Qingzhou, Liang, Xi Liang, Youzhou, Liaodong, Huainan, Nanyang and Xuzhou all need to be absorbed.
Most threads are about bug fixes or missions regarding improving historical accuracy but for me a philosophical grounding for my campaign as Cao Wei to re-establish the Han Dynasty (Currently titled as Cao Cao - Chancellor of Han) would be the greatest bit of historical accuracy I could ever ask for and I wonder if anyone else has had a similar issue.
I find this mod to be incredibly fun and thank the creators for making me revisit the sort of philosophical discussions I used to have with my mother so this is not a criticism of a mod I think is beyond anything I could have asked for.
(No Neo-Confucian soft heart here. My family has been staunchly Legalist in philosophy since the fall of the Joseon Dynasty)