Oh man lots of discussion going on.
All I was trying to say with my previous post was not to make such hasty decisions on whether to ban Froslass or Snover. I did say that the decision is ultimately arbitrary, but that doesn't necessarily mean that that's a bad thing, especially if we don't want to ban both Snover and Froslass.
I think people should remember that there actually isn't supposed to be an "independent variable" concept, especially in this metagame where the banlist is supposed to be built by subtraction from the allowed UU list. Had Smogon discussions gone differently, we might have had a metagame containing Froslass, with the Snover line banned, and in this case Snover would be the BL dropdown and thus the independent variable, and UU Hail probably wouldn't have existed until then.
However, I do believe there is a different reason to suggest that Froslass should be the banned Pokémon, which others have alluded to but failed to use explicitly. This reason is that Froslass provides a global benefit (like Stealth Rock does), while Snover benefits only certain types of teams, a local benefit. Thus, banning Froslass will probably have a less "biased" effect than banning Snover will. I suppose this is what the people calling to ban Froslass are really getting at.
I'm also beginning to think that the Uber characteristics are becoming stale/outdated. People are starting to take them way too literally, and the Support Characteristic seems to have become the "backup" characteristic in case you argue for a different characteristic and an opponent takes that characteristic more literally than you would like. However, I suppose I shouldn't go too deeply into this in this thread...
@ Heysup: We're not "overlooking" Froslass's ability out of hail. If she's broken outside of hail, she's broken, OK. If she's not broken outside of hail, then she's arguably has as much of a right to stay as Snover does no matter how good she actually is (though I think the above point is a good point to make to choose to ban Froslass).
@ Pink: I don't know about others, but my post was about Snover and Froslass, and Snover and Froslass alone. If they are broken together then that's a problem; this has nothing to do with Walrein. I also don't think anyone said that both should be banned necessarily.
@ Pink again: You keep saying that the metagame would be more improved by banning Froslass than by banning Snover... If this were such an obvious and objective statement then doesn't that mean that Froslass is broken outside of hail anyway? And if Froslass is NOT broken outside of hail, who are you to pick and choose which metagame we should play?
@ d2m: Evidently, Curse Regirock is not considered broken even in sandstorm. I mean, wouldn't we be talking about it if it was? The point was never about the auto-weather; it was about auto-weather in conjunction with Froslass.