Broken quests is one thing. I don't see anything wrong in using the environment against critters. It is what it is. Critters cheat as well; unlimited SP. Red named immune against everything etc. So finding a way to use the environment is like the tactics of defense vs offense. It's always an evolution.
However to exploit game mechanics to be more powerful then anyone else can be with is not WAI - that's cheating. I don't care; I mean I play my game and I don't envy people who play and complete anything on EE while cheating. I just consider their accomplishment worth spit in those cases. But it'll be up to Turbine to see if it's worth fixing. I will continue to play my game. And cheaters will find ways to justify what they're doing.