With the recent tour mode addition to Assassin’s Creed: Origins, I think it would be quite a cool addition to this game considering how hard they worked on recreating the area as accuratly as possible.
Having a virtual tour guide talk you through the historical significance of certain castles or any stories about an area that wouldn’t have been relevent during the game itself (such as events that may have happened a hundred or so years later) could be quite fun.
It could maybe also then be used in schools as a teaching aid in history lessons.