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A folder is an area of responsibility that will never be done unless your life changes. For me, "Book Reviews" is an area of responsibility. I'll finish individual book reviews, but I'll never finish reviewing books until I retire (or I decide that the return doesn't compensate the investment, but I hope I never get there!).
But those buckets are almost equivalent to folders in your definition, aren't they? They also can't reach a state of completion.