I mean I guess for legendary shards but I feel like it should just say that, I don't even do them because my level is to high. I get it's for lower levels but I feel like after you reach a certain level they should change to legendary shards.
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Do all your powerful first to get all gear at level, then do your pinnacles to get even higher gear, then switch highest weapons to alts, rinse and repeat. More efficient and more time consuming than just doing pinnacles.
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They help your alts when pinnacle grinding too.