Hello.
I also felt it was a bit wasteful to receive duplicate items.
When I started this game, I learned all the races and classes early on, and as a reward for defeating the world boss, I’ve already received the 'Race and Gender - Collector's Package' three times. Of course, it’s a valuable item, and there are people who would want it, so I don’t want it removed from the rewards.
I have a suggestion:
What if IS items were classified by rank or price range, and we could choose a certain number of similar items to exchange for items of the same rank?
If we were to exchange items with the same quantity, it might cause issues from a revenue perspective for the management, and from the user's side, it might be disappointing if expensive items could be exchanged for cheaper ones.