You keep arguing about how carbuncles aren't egis, but how are fairies any different.

Arcanist is the DPS class, plain and simple.
If they're reworking the healers enough for balance, then it makes far more sense to separate out SCH in order to rework it's mechanics.

There's no reason why either Arcanist jobs need so many DoTs and dps spells. They don't upgrade like the other jobs.
You have Bio/II, Miasma, Miasma II, Ruin/Broil, Ruin II.

Stick Miasma and Ruin on ARC/SMN.
Give SCH Bio and Broil. Add in whatever new ranks of those spells are required to give them enough to work with.