It's possible to legitimately beat ANY strike in this game, even heroics and nightfalls. The reason most people prefer not to is because there are easier and quicker ways. Humans have always been about finding the easiest and quickest way to get something done. Would you rather spend 2 to 3 hours doing it legitimately, or 30 minutes exploiting the crap out of it? “What the ancients called a clever fighter is one who not only wins, but excels in winning with ease.” ― Sun Tzu, The Art of War