Raids provide some of the most fulfilling and enjoyable PvE content in this game. If you’re going to limit pinnacle rewards to a single activity, once-a-week loot caps should be removed from older raids (a la Season of Arrivals) so as to keep them relevant.
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For season of arrivals, it was just because those raids were going away and they wanted to give people a chance to get it through the raid before it was gone. If it happened now, then people would just farm it for a day for the exotics that are not currently timegated