Healing responsibilities after 1.20

[grandm]

Unless the point of using them is not the damage they do, but increasing the damage potential of the party by increasing DMG and ACC against the target.

maybe, i can't say i thought of that, but in any case it seems to me this would be minor sub job for the WHM to do at the very beginning of a long boss battle. and by no means the primary focus of WHM, it one of them things that will be helpful if it hit but i don't think it would be the difference between life or death. nor do i think it really makes much of a difference to the OPs concerns on how to set up his CON with materia, primary job healing that is your only real concern