I was just coming in to post a very similar post. I didn't follow it's development, it going live was a pleasant surprise, until I tried to use it.
Kupo nuts to "take it to the retainer" when it's already in the retainer's inventory? Moronic. I could see it if I was trying to move it to another character, or even if it was in my inventory and I wanted it moved to the retainer. But it's already in the retainer's inventory. Dumb. Just dumb.
This will go away when they discover no one uses this app they put so much time and effort into. Foolish.