Yeah I have done nightfall without cheesing it, but it's just repetitive and doesn't feel like an accomplishment. You can manipulate the enemies ability to predict your movement, kite the melee enemies easily enough, and don't get greedy on damaging the boss, it just takes some persistence. The problem is it takes so long and the rewards aren't worth the effort. Honestly though, I could do the whole raid solo if it didn't inherently require multiple people. It is way more efficient to just cheese everything. Even more efficient than that is to just not play this poor quality game, but that is another conversation altogether.