Flower POW and the Leaf blower are the two “why do you exist” weapons from plantera.
Flails are only ever used as an early game melee (mace and hurt ball) or early to late HM (Flailron). So I would like to see some changes to flails such as the drippler Crippler. The projectile you get from launching it plus the high base damage makes it almost worth going out of the way to get it.