One thing I always loved about Guild Wars 2 was that you could easily see that an Item served as a crafting item because of the tooltip stating which crafting disciplines you could use it with.
Nowadays Anet doesn’t seem to care about that anymore because you don’t find these kind of tooltips on the newer items like watchwork sprockets and charged Quartz crystals.
It was a really nice feature, and I would be happy if you could implement it again.