This was fascinating reading, I must say!
Re: Wings and swords, sword of Duality was incredible in that we finally have an item pose (via the jacket) that allows for ARM MOVEMENT. This is something I personally have been secretly wishing for since around 2012, but knew wasn't very likely because of the practical difficulties involved. If more swords are what's needed to get cool developments like that off the ground, then give me an armoury!