Upside:I mean "Imperial Warriors are just Built Different" is just baked into their culture. The "Roll X take best Y" is just for being Dogmatic shitheads, which lets them get away with a lot less than other people do. We can compensate for that by stacking modifiers but there's ultimately just no way to match their Dice Shenanigans without being Dogmatic either.
Their rando ganger conscripts are better than our professional soldiers in skill, but the best skill in the universe doesn't create victory where it's Actually Impossible, if the mismatch in quality gets high enough.
A Song that Hits their morale hard enough could force them to use their "kill everyone not sufficiently dogmatic" trigger that leaves them taking worst dice instead of best.