The blade is used for lifting the vegetables after they have been shredded. They are cut, and swept up with the knife blade and the left hand on top (assuming you are right handed).
It isn't a chopper that you put a second hand on top. The fingers of the left hand are curled and steady the veg to be sliced, the knuckles, or rather the middle joints of the fingers provide the guide for the knife. Obviously the knife never comes higher than the knuckles.
It's not a cleaver either although they are sometimes described as a 'Chinese Cleaver'. The blade is very light, very sharp and very 'fast'.
Japanese and Chinese knives have specific uses, whereas in the Western world, one blade shape (the cooks knife) is available in different lengths. You wouldn't for instance use your vegetable chopper for slicing fish, you would use a fish knife, although each one *could* be used for the other.
I am a chef, with an obvious interest in the tools of my trade... blades.
That fancy Damasus blade looks nice, but it has a chisel edge. They are easy to sharpen, but I find the blades heavy.