Skeleton keys should be a guaranteed drop from your first nightfall (per account) every week, I think that would help them feel at least a little more satisfying.
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That would be nice but i dont see why we can get a huge increase in skeleton key drop from heroic strikes. We are all mostly after the strike specific loot be it weapons or armor. Even if heroic strikes guranteed a skeleton key drop for every strike completed it wont be a problem. All gear from the strike chests are randomly dropped with random stats. Even if you get that specific piece of gear you want you wont have the roll you want. There will still be a grind but it will at least be more rewarding. Heroic strics should always give a skeleton key.