Tbh the full exotic should be reverted back to 10 seconds, I think if it buffed the class item it would be too strong potentially.
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I feel they could possibly find a middle ground for both if they choose to do so. Somewhere around 7 to 8 seconds instead of 5. It is surprising how much two to three extra seconds on a buff can matter. I can still see them reverting the original and keeping the current for the spirit perks on class items though since after all, this is Bungie we're talking about.