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Everything computes in a general sense, even atoms. But one could just as easily say everything is "just" mathematics because all models of reality are mathematical. In general I think it's important to be wary of totalizing ontologies and metaphysics of reality that reduce everything to a single universal substance (monadology) or activity like computation (computationalism).

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It doesn't seem that important, unless you can say why in this case it's important.

This seems to be saying "mitochondria aren't only the powerhouse of the cell - they also do computation." What's to be wary of in this case?

It's a vacuous statement. All physical systems are computers because the logic of computationalism is circular. Everything is a computer so there is no meaning in the statement and the danger is that as more people start believing in the circular logic of computationalism they'll be more willing to delegate their cognition to computers even in cases where they should not, e.g. social media and algorithmic feeds designed to increase engagement and profits for advertisers.

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