Since the vassal limit bonus from dynasty prestige has been removed, I've been thinking about if there is maybe something we could replace that with. Basically something that you can use your dynasty prestige on to improve your entire family. The idea I came up with is somewhat inspired by the idea system from EU4. Basically, you can spend dynasty prestige on dynasty legacies that give all members of your dynasty small bonuses. These can be single stat point bonuses, increases of army moral, increased power of specific troops, extra vassal limits, and even a small bonus to demesne size. Obviously, some bonuses are much more expensive then others and probably don't have the same number of levels (like demesne size might only have one level, but increased light infantry power might have five levels).
What things you could take might also be dependent on your government, religion, or culture. Such as bonuses to special troops or cultural troops or to help you claim the Papacy more easily.
What things you could take might also be dependent on your government, religion, or culture. Such as bonuses to special troops or cultural troops or to help you claim the Papacy more easily.