I owe a great deal of my 30/50 Hall of Monuments score to feathers. In Guild Wars I farmed these things more than I wanted to, and they funded virtually all of my HoM. And now we’ve got an actual crafting system, and no feathers. It just doesn’t seem…complete…without them.
I propose adding Feathers as a fine crafting material. Harpies, griffons, raptors, and moas jump out as obvious candidates to drop them. They could be used to make Sentinel inscriptions and insignias, new potions if/when new enemies are added to the game, and a host of other possibilities (stuffing for beds/chairs if Furniture crafting is added if/when we’re ever given player housing, for example).