I can't deny that Glaceon with Snow Cloak is less dangerous than a Garchomp with Sand Veil, both when considering base stats and tier placement. However, there's no reason not to ban Snow Cloak if there's a reason to ban Sand Veil, since Sand Veil and Snow Cloak both have the bannable quality of an evasion increase in a weather condition. Contrarily, though, I see that there is also no reason to ban Snow Cloak, as the ban wouldn't affect the metagame much at all.Out of the hundreds of battles I have done, I think I have fought about five hail teams ever, excluding mine. Two of them had any Pokemon with Snow Cloak, and I don't remember it otherwise impacting my battle. A Glaceon with Snow Cloak is a hell of a lot less dangerous than a Garchomp with Sand Veil.