Cloaking Device

Why didn't the Federation use the cloaking device from TNG season 7 episode 12 "The Pegasus" during the Dominion war or against the borg? It's was war I'm sure they would give the federation special sanctions to use it like can only be used to fight the enemies or only in the gama quadrant or something along those lines. It would have been easy to cloak through the borg shields rematerialized inside a cube drop a torpedo off and cloak out or give a torpedo the ability to do so it's self. Similar tactics would have ended the Dominion war sooner I think. Everyone knew the federation had it especially the Romulans so why not use it?