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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There's no good reason we shouldn't be able to earn endgame materials from a variety of content, not just grinding one hamster wheel. Raids, PvP ranks, dungeons, and various other content should reward materials alongside Nightfalls and lost sectors. It feels like Bungie aims to make content like Nightfalls relevant by forcing players to grind it in addition to everything else we may want to do. But to me, I'll just keep my armor at 7 because I don't enjoy playing the game in that way.