Nightfalls as they currently are are worthless once you get past 310, so you shouldn't really get upset over the fact taht you completed one and didn't get something worthwhile, because, lets face it, and 313, you aren't going to get anything worthwhile.
Rather, nightfall should return to what it was year 1, where an item can drop with the highest light attainable, and, more importantly, bring back the rep boost.
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If they added the rep boost then i could care less of the rewards