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Awesome job, this is a very hard to do on Heroic!
We actually talk a lot about intrinsic rewards vs extrinsic rewards and they apply differently to different situations.
Here we decided that putting a reward of some object behind this incredibly hard task would probably cause people to grind it out even if they didn't enjoy it, just to get the reward. We prefer for tasks this hard to let people complete them because they enjoy the process (this is called an intrinsic reward).
We do put a reward behind beating each wing once because that is a much more attainable goal for most people.
Glad you enjoyed Heist so much, and I am sure you will like the new adventure we will start talking about in a week or two.