I think he was saying that games where your running speed is based off of the weapons you have in your hands are a bit unrealistic. Games sometimes make you walk at a crawl when you have a machine gun out, but then you pull out your knife and can sprint as fast as anyone else. The weight shouldn't go away just because you shoulder the weapon.
ah, that makes more sense, i also thing i read his thing wrong, only got a few min before i have to go to work, sorry everyone for my hurried stupidity
anyway, i kind of like the idea, i mean a heavy with a Minigun should move slower than a heavy with an SMG