Bungie is introducing a new difficulty for some activities that will be brutal. Why not add this feature to Nightfalls? Imagine KNOWING that you will be granted a loot drop if you can beat a Nightfall at this difficulty. If you aren't exactly good at PvE, that's ok, you can still grind out Nightfalls the old fashioned way. I'm certain that Legend difficulty Nightfalls will take 20+ minutes on average, which is a lot longer than sprinting through every Nightfall in less than 8 minutes until you're eyes bleed from boredom. At least this way, you remain engaged in the activity because it requires cohesive teamwork and you know that you'll be rewarded with a guaranteed loot drop. Don't forget to bump.