Unusable Boss FATE Reward Tokens
Once all collectible items from a boss FATE have been achieved, there is no further use for the items these FATEs drop (Archaeotania Horn, Daivadipa Bead, Mu Cog, etc). There is also a little bit of sadness in throwing out these now-useless dropped tokens. Some other players I have spoken to (~40-50) also expressed a wish to be able to use these tokens.
I propose that each vendor in Shadowbringers and later who takes these tokens have an item added where each token can be exchanged for 1 Bicolor Gemstone. It would not cause great upset to the amount of gems these FATEs drop, and ultimately, little would change in terms of economy or numbers. However, I believe this would greatly enhance the player experience of these world boss FATEs after the initial completions, since the dropped tokens would be felt to have some amount of use, no matter how small. This would preserve some of the joyful experience of gaining these dropped items, instead of them quickly becoming useless trash to be thrown away.