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> and there's no parallel fold.

When working up from the bottom it might seem that this is just manual stream/list fusion. But the parallelism is the key prize. We need to stop defining map/filter etc in terms of lists/sequences, and, once we do, there is nothing to fuse, no streams/thunks to avoid allocating etc, because they were never essential in the first place, just an artifact of the history of FP and its early emphasis on lists and recursion.

Yes, foldr/build is almost exactly reducibles, but not foldables.

Iterators do nothing for parallelism either.

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