I'm sorry it's taken so long for us to get a response for you on this topic and I agree it is extremely frustrating to accidentally NPC/drop something you didn't intend to. We were able to discuss the issue with Yoshida and he said that they will be looking into a method to easily reacquire achievement/quest reward items from NPCs and the like (this is also in addition to the previously discussed "buy back" feature).
Also we asked the UI team about making it more difficult to accidentally sell/drop Unique/Untradeable items (maybe with specific confirmation windows or other methods) and they said that they're currently looking into that as well.
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