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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core content can drop them now with ghost perks. Double drops from nightfalls. Don't know if it's needed. Seems like Bungie gave us more options already.