Two ascender on one rope plus backup knotted rope

Seems to me combining the one rope, two ascender method with using a y-lanyard to clip into a backup knotted rope would be the best of all worlds. Does Petzl leave that out just because it is too complicated? It seems to eliminate the lack of redundancy concern with the one rope method, while also reducing the chances of a potentially high fall in the one ascender with knotted rope backup method. Thoughts from the Petzl team?


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