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If that is your position there is nothing to respond to. You would be coming at this with a comic-book level of certainly over your own personal understanding of what the physical limits of the universe are. If your position is that you agree such a machine may be possible but is, let's say, too difficult to construct in our lifetimes, then that's another thing. Then there's a debate. Then it makes sense to look at how it can or cannot be built. You've outlined your position as the former, but if you want to clarify that it's in fact the latter then please do.