Thats what people said about the salvage glitch, and low and behold a year later they banned half the end game community on xi. This is definitely an exploit, you are meant to do the dungeon for your gear not quickstride to the chest, die and re enter. By the time you get out of the dungeon all you have to do is wait for weakness to wear on the tank before you re enter, or if you have multiple tanks with quickstride you can substitute them out and re enter immediately. The best gear in the game is meant to be worked for, not gotten with little to no effort.