No, because buffing something isn't so easy. As the weapons are different, how do you know the exact amounts that you need to buff so that they're balanced. What if they buff it too much? Should they then in turn buff the other weapons accordingly, also? And if they did that, should they buff the health too, because now the weapons' damages are all different? It presents a myriad of problems. Nerfing is required so that the buffs don't get stuck into an exponential loop.