Why didn't feudalism encourage the development of means of production?
Feudalism did not involve means of production, or if it did, only in a very limited way. It is a word used (increasingly less often by scholars) to descibe relationships between lords and vassals. It was not an economic system, but rather a system of political relations based on the granting of land and privileges in return for political loyalty and service. These obligations were reciprocal, but not normally economic except inasmuch as they often involved land, one of the "means of production" in medieval Europe. The economic system that most associate with the medieval period is manorialism.