Just going to say it: if you got your crucible/gambit/vanguard pinnacle weapons, they should be crossing into new content.
These are not random rolled items that are farmed - these are things acquired via quests for a reason. Leaving them in a state of obscurity is making those triumphs irrelevant and the tasks to complete pointless.
I get there will be more quests around gear for more pinnacle weapons, but the message sent here is "why bother since it will be moot in a year".
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Honestly, just keep using them and just switch your loadout in Trials and Iron Banner. Sunsetting is -blam-, trust me I think it is a pathetic excuse to rehash and reissue the same gear to us with higher power caps, but it doesn't hit every aspect of the game and that is the biggest problem. Crucible meta won't change - because the majority doesn't use power level, so gear being sunset won't matter in things like Quickplay/etc - players will keep using the overly abused and overused things like Revoker, Recluse, Mountaintop, etc. This only forces players to change gear/chase reissues in order to do Trials, Iron Banner, Raids, and other power-level-matters activities; a tiny fraction of the gameplay as a whole. The proper way to implement this would have been to make your power level matter everywhere - so gear is truly sunset from all activities when it hits its cap and content progresses past it.