I don't have a job high enough level to exploit this, thus I have never done it. I can tell you right now the people who are whining about what they call an "exploit" are the people who would gladly exploit it if they had a job to do it with.

There is nothing to stop you from completing the objectives. Stop whining you little babies. It's not an exploit that people kill mobs for 15 minutes instead of running to the next Fate to kill mobs.