The question that keeps coming up for me is: Why return anything to Earth?
If you can solve the problems surrounding processing and fabrication in space, the possibilities are staggering.
If you can construct something, you side-step the cost getting the damn thing "off" the Earth. This overcomes a lot of limitations on what can realistically be accomplished in space. I think it would be the first "baby-step" on actually using space for more than photo-ops and bragging rights.
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