Toxicon is a DPS loss and there is no point in shielding people that wouldn't have died anyway. Throw a Physis or an Ixochole and you can continue your... Dosis spam. Which is the same as Broil spam. Or Glare. Or Malefic.
White Mage is very involved too if you apply Dia, throw some Glare, then Assize, a couple of Holy, two Dia in a row, three lilies in a row to proc Misery and so on.
Now if you play jobs the way they are intended to be played, things start looking different...