I am aware but we do not do maps all too often as a group so my retainers are always full and each time i gather... it is annoying as hell.
It is not asking for much and is easy enough to allow them to be stackable.
And why would they not want people to hoard maps? Last i checked the value has dropped significantly.
Anyhow it was just something myself and many players that gather would love to have as a QOL improvement