Raids are endgame content. They require coordination, communication, and team effort. In my opinion, each chest should drop an Enhancement Prism, and the final chest should drop an Ascendant Shard. Raids aren't even as farmable as Nightfalls, so I don't understand why they don't include raids as a path to these materials.
But that's just my opinion.
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Upgrade materials should drop from any activity classified as endgame or events. Meaning: -raids -Nightfalls -hitting 5500 in comp -iron banner -legend+ lost sectors -trials(at 3,5,7, and flawless) They’re just materials to progress all weapons and armor in this game. Players should be able to farm them by doing whatever endgame stuff they wish.