Some examples would be small stuff like SRL gear being unobtainable due to the record book not existing or class items not dropping from silver engrams or sidearms...
I don't know if this is possible anymore but if you could an actual final update that ties up these loose ends...
If I was bungie I'd do this if we were bringing D1 to PC that's the only way I see this happening
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I could see bungie making a destiny 1 revamp similar to what they did with halo