Question!
What if:
Pathfinder armor was changed to Piercing + Elemental defense.
Sentinel armor was changed to Elemental + Piercing defense.
Shade armor was changed to Shadow + Elemental defense.
Ghost, Hex, Wraith, Guerrilla, Hazard and Keeper armor remain the way they are, with Normal + the family damage type.
That way if you want all-round damage, you're sacrificing Normal defense. Not like that's a problem anyway, it suits gunner armor because you're not supposed to be getting hit by melee attacks anyway.
Or should it be the inverse, with the family armors dropping normal defense, like:
Hex and Guerrilla with Shadow + Piercing
Ghost and Keeper with Shadow + Elemental
Hazard and Wraith with Elemental + Piercing