Here are my problems with how the Armoires are currently:
-Only certain types of items can be sorted in them.
-All items need to be at 100% condition.
-It removes the spiritbond on any item you put into it.
-They're not excisable outside of the Inn room, meaning if you need something while out on the field you have to warp to a town with an Inn.
Here's my suggestions to make them more then just glorified trophy cases:
-Remove the need to 100% conditioning, there really is no reason for this.
-Don't remove the spiritbond on items, again, there is no reason for this.
-Allow all equipment to be stored in them. A lot of people are already having issues with their inventory/armory and those of use leveling classes/jobs all at different levels feel it the worst. This way, all the stuff we need on the fly can go to their retainer(s), while all the stuff we're saving for latter or is fluff/glamour can be stored in the armoire.
-If the last option was too big, then at least allow us to store more types of equipment in the armoire like raid armor and/or dungeon armor.