So nightfall are very lackluster nowadays and basically for the past year since forsaken. Mainly because with each new expansion the power level cap goes up but not the requirement for the nightfall to accommodate players without the expansions. It becomes a swift ride to the point where even the handicaps do very little. So a suggestion I would like to make is what if the nightfall didnt have a set power level requirement. The power level requirement could be the average power level of the all members in the fireteam participating in the nightfall, not taking into account the handicaps, which are meant to provide a further challenge difficulty. Just a thought.
I'm pretty sure you can make it as hard as you want.