Everyone I've ever played with has played by intent. We don't argue about placement, we accept that an angle is possible, and a well stated and reasonably positioned model is good enough. (We also help with can that guy see here? Yes/No how about here?) That being said, in my experience when playing against intent super jumpers, the best defense to to use prone more often. Being prone dramatically changes that steepness of the angle needed to aquire LoF. Super jump can still wall hack, but they need to be on top of a building you are prone next to, models without super jump need to lean out, likely giving mutual LoF. I hope that didn't go too far off topic.