So many CONs need a tissue, because they are assuming things before reading in DETAIL.

They SPLIT the elements between the mages. CONs are aligned to elements that are more in tune with healing and enhancing, like Water, Wind, and Earth. Giving you some magic attacks, but mostly based off those 3 elements.
eg: Deals earth damage to the target. Chance to reduce evasion against earth magic. (So slow is more effective after this spell is cast)

THM on the other hand is based off destructive elements: Fire, Lightning, Ice
and their nukes apply effects as well: Deals lightning damage to target. Chance to inflict Stun.