Historically I think there has been a lot of support for being able to craft with items that are stored in our retainers. I am not sure what implications it might have for the servers but it would definitely resolve some of the inventory issues plaguing the game. We can already check to see if we have an item in a retainer on the market board which means the game must save that information for use outside of checking the retainer's inventory itself. Has there been any official discussion from developers on moving forward with it? If you have any interest at all in this I implore you to make thread(s) on it known so we can make retainer use more robust.