Is there any reason Mysterious and Treasure maps are labeled as Unique?

[Sadana]

There is a simple workaround which I use all the time - stack one in your inventory, decipher other, next two in the retainers and any above those 4 moogle mail to your friend(s). They'll do the same. Then if you are let's say in group of 4 you can run 8 maps in one go, then stop at moogle mail to pick up another 8 and rinse repeat and in the end pull last 2 each from retainers ...

I think we all do this already... we shouldn't have to, they're just maps...