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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"raids aren't as farmable as nightfalls" Gonna have to big disagree with you there. I've done 7-10 scourges and 10 or so last wishes in a night before. There are a ton of people who do it almost weekly. I would be cool with once per week per character per raid (total of 9 per week rn) tho, just to give people a good reason to run raids.