He's not arguing about challenge mode.
He's saying that there is no proof that the final clusters come from WotM challenge mode.
Also, Luke Smith did not design Wrath of the Machine. He's been working on Destiny 2 since TTK.
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He designed TTK, and since RoI is just an extension (not rework) then it would be the same.
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That's not how it works. There could absolutely be different rewards for Challenge mode.
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Considering that the rewards for WotM are exactly like the ones in Kings Fall (t. The Armory), I'm pretty confident that they'll be the same.