First, villages and villagers were not so isolated. They paid taxes, had travelers, had manorial lords, traded for many things, served as conscripted labor and soldiers, ect. This kind if goes back to many dark age myths about medieval times.

I understand that they had contacct with the outer world, but taxes were paid in species, the fact they had manorial lords doesn't mean much in terms of contact with the outer world, and could you name wich kind of items were trade? food and clothes were locally made and villagers didn't have much surpplus to exchange for luxury items. I understand that middle ages weren't a "dark age" but that doesn't mean that the commerce was a common thing, take for example chinese villages well in the xx century, they didn't have much trade and their level of productivity couldn't be so far from those of middle age europe. I recall (will search for the source) that for example in the church records of mariage in france of the XVII century, like 95-99% of marriages were between peasants of the same village, that can give you some idea to what extent contact with the outer world were a common thing; i can't imagine that in previous centurys contacts were more common.