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

[Razzle]

Edit: For clarification, I KNOW what Unique means and how an item labeled as such acts. The question isn't WHAT is Unique, but WHY is it Unique.

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Hi,

Anyone knows/can think of an answer to the question above?

It's been very annoying for me since I rather do the maps with friends. I rather save up on maps and collect them daily until both me and my friend are free to do them.

But SE doesn't let me, instead, I have to get a map, put in retainer, get another map, put on another retainer, finish one map, teleport to moredhona to get the other...

Why do SE trying so hard to make the game so inconvenient...

I was thinking that maybe there was a balancing reason I can't see, that SE see, but really can't think of what it is and wanted to hear some ideas that may enlighten me as to why it is designed like that...

Am I the only one who finds this extremely annoying? lol

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 ...

This is exactly what I mean by "inconvenience"