"Period Independence: By and large, how well history goes as a whole is a function of how well things go during each period of history; when things go better during a period, that makes the history as a whole go better; when things go worse during a period, that makes history as a whole go worse; and the extent to which it makes history as a whole go better or worse is independent of what happens in other such periods."

How far can this go? If I slice history in 1 day periods, each day the universe contains one unique advanced civilization with the same overall total moral value, each civilization would be completely alien and ineffable to another, each civilization only lives for one day, and then it's gone forever. This universe holds the same moral value as the one where only one of those civilizations flourishes for eternity?