Wind main is really tanky too considering people run her with a life mood and flower guard is gives her protection from cc. The most successful main in Arena is probably wind main, and the only people who win with a water main these days (in Arena Atleast) are people who run the heal cancer with her. IMO, none of the mains are balanced, and maybe it was meant that way to give people an inherent advantage in battle or give an extra layer to make battles more exciting. Arguing over who is more broken is never gonna give you a concrete answer, every main has its goods that can be easily countered by the other main.