We don't know if we can build UMM's. This does seem to strongly contradict a lot of ideas that no computational system in the physical world will be able to bea

We don't know if we can build UMM's. This does seem to strongly contradict a lot of ideas that no computational system in the physical world will be able to beat a Turing Machine exponentially. In a way UMM's right now are just saying "what if we can do this special computing thing" and proving that than P=NP. It only becomes surprising if we can actually build them.