I have proposition to delete "cannot put in deposit" for Routine Stone item. Reasons are simple: 1. Collecting 30 of them to buy one item is so annoying. Now I have started collect and have to wait one mouth to buy one item :(
2. I don't see any difference between collecting by all my characters every day and after 15 days buy 3 or 6 just to buy draconite (it is best option in my opinion), then use all of them by putting Routine stones in the deposit in shorter period of time.

I also informing that in game "Help" you don't have information about this: https://ibb.co/G58BT65

Best regards