About banning hail. One thing we have to realize is that if Hail stays, sooner or later we'll have people asking for sun and sand (rain obviously not possible). To be honest, if Snover stays, I don't see why Vulpix or Hippopotas shouldn't be allowed too. That's only fair. But if they DO get allowed, we'll be suddenly facing weather wars in pretty much every tier, and that is not a good thing for people who try to run away from that (which is a reason I don't really play OU).
So, either we accept that weather wars are an integral part of this game, or force lower tiers to abandon them altogether, without letting a single permanent weather stay. In my opinion we cannot eat the cake and have the cake, so please keep that in mind.