I see nothing wrong with the mortality of the lords. Maybe they should reduce the chance of death and definitely need to change the AI in battle so that the lords stay behind their army, and not rush to the enemy to die. This infuriates most of all when the offensive begins, the lords, without waiting for the infantry to reach the enemy, are already rushing at all times. If I can handle my own clan members, change their formation and leave them behind, then not with others.
And you also need to include mortality in the auto battle and in the general simulation. Otherwise, it turns out not very honestly, while I am at war with one kingdom, lords are dying on both sides, then I start a war with another faction, I have fewer lords, and the enemy is all alive. And again the lords die, and then the war with the third faction .. In the end, my kingdom is weakened to such an extent that there is no one to call in the army.
And they also need to shorten the period of growing up of children. Now this is a very long time and often I already have time to capture almost the entire map, then what's the point ... We need to balance this urgently.