FWIW I’ve seen the same thing said by other people elsewhere, though of course it’s possible that they and the HN comments derive from a common source. Also, my understanding is that the amplituhedron approach produces the exact same numbers as enumerating Feynman diagrams does, just quicker and in something more like a closed form, so it has to be as local and unitary as any other way of doing QFT.
FWIW I’ve seen the same thing said by other people elsewhere, though of course it’s possible that they and the HN comments derive from a common source. Also, my understanding is that the amplituhedron approach produces the exact same numbers as enumerating Feynman diagrams does, just quicker and in something more like a closed form, so it has to be as local and unitary as any other way of doing QFT.