There should be a possibility to extract skins from weapons that had their appearance changed.
This is mostly needed for skins that players can get from Goddess Cubes.
I realise that weapon skins are probably supposed to be a rare show-off part of your character but currently it doesn’t even work that way. These skins never get used becuase players find them too valueable to waste.
Players just hide their GC weapon skins at the very bottom of their Personal Storage.
Even end-game weapons are not a very good pick for these skins because players can never be sure if they won’t be switching to a better weapon eventually (especially if there’s a perspective of maximum player level being raised again).