Think of skills like Skull Sunder and Fracture, which are Marauder(VIT) skills that you can place on DRG(STR) skills. The "weaponskills" you use on your job are influenced by the main attribute of your weapon, this is what they are doing for healers.

Originally they just designed it where all magic spells from the mage side=INT mod, now they've specialized it to be based around the main attribute of the role.