The difference is that no matter how perfectly one presents a swung fly, you are still have at best around a 50% chance that a fish will move (I made up the 50% figure--but it illustrates the point). No matter how well you do it, or how deep you get your fly, a majority of the steelhead will not chase your fly. When you're nymphing, if you do it perfectly, your odds go through the roof +/-100%. The swinging fisherman is still significantly limited by the method--no matter the technology. It's easier to cast flies on a longer rod, but it is no easier to catch that fish you can now reach on that longer cast. Casting further isn't changing the rules. Same odds, more rolls of the dice. I think that when you are presenting flies vertically, dead drifted, you're changing the rules, stacking the odds. And again, it's not the nymphing that makes someone greedy.