I said since the start of the Pillars of Eternity beta that melee damage output and ranged damage output should be governed by two different stats. Put spell damage on intellect while we are at it.
For me, Intelligence affect the damage of spells does not and has never made sense since D&D. I dont know, I just dont like it. It never seemed right to me. In D&D, Wisdom seemed to be a better option and in PoE Resolve seems to be the right choice.
For me, the logical solution should be this:
Melee weapons and bows -> Strenght
Wand, scepter, rod and spells -> Resolve
Resolve reflects a character's internal drive, determination, fearlessness, and the emotional intensity they can project to others. It can be useful for mental intimidation, leadership, and convincing performances.
Crossbow, arbalest and firearms-> No damage added or reduced