What the should do is put Ascendant materials, the Cahtterwhite Shader, and other misc. things you can get in the Vault of Glass in chests and least get "9 Ascendant Materials" instead of getting "3" and you get weapons and armor for every checkpoint and the 2 bosses you deafeat.
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That defeats the purpose of having RNG. If it were that way, the raid would be dead in a few weeks.