Add in to this fact that weight is usually best when added furthest away from the bows center, and now it makes a lot of sense. Now you can add the weight at the ends of the stabilizers rather than have it on the actual bow.
Translate this to hunting.
Why is a light hunting bow (when we're talking about the difference in weight being most times less than 1 pound) so important to many? I don't have an opinion as to why the heavier bow ISN'T "our" best option. It would seem, for hunting, that it would be. Wouldn't a heavier bow (in theory) be quieter?
Again...I don't know.