Well we wouldn't ban it for over-centralization otherwise we would just end up with OU(Kyogre over centralizes). HOWEVER, we can ban it because it's far too luck based. Sometimes your opponent gets the boosts they need while other times you manage to deal with the inconsistent poke before it does too much damage. Neither player has any control over it and its basically a series of crap shoots over several turns. In addition to that its just not fun to play against IMO.