Does anyone know if the liege's culture's innovations will affect the entire realm? E.g if the liege's culture has an innovation that improves development in counties, will all their counties get the boost or just the ones with their culture?
So, if you have Irish provinces in your realm, their get a their improved development from the Irish culture, regardless of what the culture of the holder is? Or do you just mean that an Irish count would apply the features of Irish culture even if he was a vassal to an English duke?