It is interesting to note that Attunement absorbs physical damage but the damage is still reflected back to the opponent.
I had a character once that I built 150 HP into his suit, 100 RPD. The physical was extremely low, and I threw on protection as well to ensure that the physical was as low as it could get.
Sometimes when I was fighting melee characters I would purposely cast attunement and then disarm my weapon. Lots of people just killed themselves.
But yes, with quivers and how easy it is to not have phys dmg from a weapon, it is not as useful as it might sound.