Agreed, the real issue here is not "completing the fate", but that one clueless player, or one griefer, can ruin the experience for the masses. It's the same thing with item fates like Core Blimey - in theory, if no one actually turns in the items, you can get AOE's on the taps and farm the instant-death mobs for 14 solid minutes.

But then there's one clueless player/duty finder-er/troll who doesn't pay attention to the shouts and just completes the fate.

All in all, the whole reason this thread even exists is from bad design.