I believe that once you reach level 32 ascendant, "rewards" or lack there of, should be taken out of the loot table. Vog hard mode, exotic chest on all three characters, ascendant material last night and Nighfall energies. Who agrees?
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Perhaps replacing them with Radiant shards/energy might be a little more palpable. While I do get frustrated at the nightfall drops at times, let's face it, that can't give an exotic every time. But I do think that it should drop better rolled weapons, stuff with more beneficial perks that makes them more useful and fun... But that's just me.