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Because we can't effectively model the behavior of human tissue in software.

by a long shot, too.

We can't even effectively model basic chemistry. We can't a priori tell you what color a chemical will be, much less many of its other properties.

Look at how much energy and computer cycles they have to put into just for folding a single protein and then realise that scaling it up at our current level is basically impossible: https://foldingathome.org/

It's not a chip like a CPU. It's chemistry and biology.