There should surely be downsides we have to take into account as well, right? Otherwise I think we'll all start stacking estate buildings like there is no tomorrow. If we use the Road Crew for an example, there ought to be a cost to better maintenance in that perhaps occasionally the work crews have to draft in extra peasants with a consequence on production/estate efficiency. Or maybe an estate will experience higher emigration as the peasantry look to dodge being drafted into manual labour.