This is the part that's most interesting to me. This way, the experiences of our medieval forebears are visualized and may help to educate the public about medieval village life.
Tithes, taxes and rents! Instead of merely abstracting the taxes into an income modifier or letting the player be the extractor himself, we could be shown the tax collector visiting the village, counting the sheaves by the side of the road, selecting the calves and chickens. And finally, something that would, in my opinion, really add to the realism and historical flavor of a medieval-themed city builder would be the introduction of mechanisms in which agricultural surpluses are skimmed by the church and the feudal lord.