Small suggestion: shifting power balance.
Waiting for the addition of estates (see next EUIV DLC), I think we could add a little event: every year, each county has a small but >0 chance of being granted to a subordinate barony, this probability weighed on
- opinion of baron-tier vs count
- wealth+manpower of baron vs count
- city/church/castle technology vs technology type of holder (eg. city in a feudal county)
if the AI decides to ask for autonomy
- if the count is AI and mono-county, he becomes a baron with a claim
- player with only one county: no risk (playability)
- if the count is AI or human and holds more than one county, it becomes indipendent (or under the same liege), the previous owner has a claim
- if the count has a liege it gets an event: he can allow it, earning better relations with all the other vassals of the same type, or oppose it, causing unrest in the province
- no chance of usurpation with tribals or mosque vs iqta
why am I suggesting this? Because, as it currently stands, 90% of the time there is no power shift during the campaign, so that counts hold the power in Northen Italy or Flanders or in the future Hansa in 867 and they retain it unless the player intervenes. This would also let making bishops in charge of several parts of Western Europe in the High Middle Ages, losing then power to both the landed nobility and the burghers.