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In the late 80's there were several highly cited efforts to use Spin-Glass models to formulate other computational problems such as: Protein Folding and Neural Networks.

Isn't it straight forward to reduce any classical physics problem into Spin-Glass which is NP-complete problem?

What I am saying is: since Spin-Glass is at least as powerful model (computationally) as any classical physics model it is always possible to restate a classical system using Spin-Glass.

I believe I am missing a huge point here, because these 2 papers are highly cited ones.

EDIT: If you downvote, please, kindly consider to add a constructive comment.