Perhaps some may think it is unnecessary, and while I agree, I think this fits better thematically. The implementation is incorrect, in my opinion. Why give random champ bags and molten stuff? Why not give obsideon or mystic coins or things relevant to crafting a legendary or precursor as intermediate rewards or if you do want to keep champ boxes and Tx gemstones why not make them fit better to all of the legendary/precursor weapons and not just Incinerator?
Would very much like to hear the logic behind this choice.