>>96318010
I do something better and post a comic topical to OP's question.
My point is that we need a basic understanding of the capabilties of an astartes and the Deathwatch RPG's are simply the nearest rule system that best simulates astartes in the lore. Could a single Astartes easily conquer a Feudal World? Yes, but not all, espeically if the cultural divide is too wide and the Astartes is a boneheaded fanatic. He won't be stupid but he could be a blind zeaot and merely become a warlord trying to murder all opponents instead of becoming a uniter figure all kings can trust because the Astartes is not interested in ruling or creating a dynasty but the glory of the Imperium and the Emperor.