“If you think the technology is infeasible, you don't worry about what it might do and what its potential is.”
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Lighter computers and lighter sensors would let you have more function in a given weight, which is very important if you are launching things into space, and you have to pay by the pound to put things there.
If you look at the various strategies available for dealing with a new technology, sticking your head in the sand is not the most plausible strategy.
We can grow crops less expensively because molecular manufacturing technology is inherently low cost.
The laws of physics should allow us to arrange things molecule by molecule and even atom by atom, and at some point it was inevitable that we would develop a technology that would let us do this.