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Having played my first campaign on the standard unit scale setting and my latest one on huge I have to say that in my opinion the game must be intended to be played on Huge as many of the features I considered pointless in my first campaign suddenly become vital when the Huge scale is used
That's debatable and only the developers know for sure. My feeling is that they were shooting for large units to be normal size but were forced to make 40 man unit sizes normal so that it would match the minumum requirements stated on the box.