I kind of disagree. In Ou there's many counters for metagross without changing your whole team, and meta has more weaknesses(ground). The only thing to be worried about sweeping wise from meta is if rng comes in from meteor mash/ elemental punches. Not saying he isn't a threat, but comparable to scizor in uu there's not much. Scizor has the ability to setup, and the pokes that can stop him are limited. Off the top of my head there's manetric, houndoom, and slowking. Two of which that are too fragile if they come in on a sd boost, and i remember scizor having quick attack for priority. If everyone runs a slowking/ any poke w flamethrower just for scizor, don't you think that there's a problem? Also i don't see the reason to not ban a poke because it might not do well in ou.