The issue is sort of solved via the instance system in the world but that assumes you have one open on your server for the area you are fate farming in. Besides, I think fates slowly fix themselves 2-3 are not completed in a zone. That said, best bet is just to smack it and if it isn't going down fast enough then just do something else for 15 or so minutes. A system showing the strengths of common fates wouldn't be a horrible idea, though I would assume it's a non issue for the majority of the playerbase for the devs to put this idea in the maybe pile.