i would have no reason to walk around at that low bodyfat. no one finds it attractive except other dudes, and you'll simply be smaller than if you're at around 10% without losing any appreciable definition for a day-by-day living.
i'd much rather be 210@10% than 194@3%. same amount of muscle, but you'll be bigger, no less athletic and energetic, and girls aren't going to think you look gross as hell from the veins.