But in a game compromisses must be done inorder to have a relative balance when a player choses one faction instead of an other.
Distance is relative too...If a game has 4 seasons per turn (3 months) a fleet should be able to cover a distance of almost entire Meditaranean in one turn!
Cities are on scale too. While "German/Gualish" villages in RTW2 and Attila seam accurate in the east there were huge cities with poppulations from 40000 to 500000 people! Even Paris in 9th century that was the bigest western city had only 15000 people and had only 1 stone tower and surrounded by wooden wall! Imagine the map that should be created for such eastern cities!
All in TW serve a relative ballance and all are about the prospective you see them.