Many posters here don't seem to realize that FFXI eventually upgraded from the key item system to the claim check system. Both had their advantages. The claim check system consumed an item of your inventory, but it allowed you to store partial sets of AF, and even multiple sets all on one ticket. The closest comparison to its FFXIV counterpart is the armoire.

And that's where I think the biggest improvement could be implemented. I think more gear should qualify for armoire storage. Now that 2.0 jobs are getting myth gear for completing their level 50 quest, myth gear should be added to that list.