Yes, mix and match does allow one to survive better in game, but wouldn't it be nice if with little sacrifice of using the full set give us more?

What I am suggesting is that since there is a concept of "sets" in the game, why shouldn't it offer further bonuses?
(this is just like in Diablo series games)

For example: if you have the grey feather cowl with its mantle, maybe you are offered with additional Elemental defense. If you add the third, Grey owlite shield = full set, then you gain bonus elemental damage to your attacks (but that doesnt exist, im just trying to prove my point)

so?