From a philosophical viewpoint, I think the ideas presented are sound but their application less so due to the huge disparity in complexity (which they acknowledge) between living and non-living systems. This is due to sophisticated information storage and retrieval in living systems, a quantum leap in generating and preserving new functions. All this life and variety flourishes on Earth, while the rest of the universe remains relatively barren.
The paper is another in a long line that extrapolates Darwin to explain levels of organization beyond speciation, but I applaud the novelty of the application of evolution to non-living systems, whether ultimately useful or not.
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