Well, I think after all of the current fixes are made (on the to do list), and then after Cultural-INfluence warfare is included, and AI-fixes for that ... then we should rework War Wearniness on a Civ-by-Civ basis
(for instance, some simply don't like foreign wars, some have MORE war weariness within their own borders as opposed to none at all, many are sad only from lost units and not from foreign "victories", and some might even be non-sad by level 1 deaths, while SAD at a level 2+ death, and SUPER SAD at a level 6 death ... I would say the Hippus, Sidar, and *possibly* Grigori would be more sad based upon unit level, although the Grigori would probably also be sad with other things as well (while the Hippus would be sad with Intra-cultural warfare, but not sad with Foreign conquest, and Sidar would be uncaring of Homeland and Neutral deaths (even uncaring of a level 6 death in homeland .. Super Sound with homeland battles/deaths) ... yet Super Sad with Foreign wars) ....
Meanwhile Illians would only be sad by lost units, Super Sad (anarchy?) from the loss of a Winter Priest, but not at all saddened by battles ... if lost no units, no WW.