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Xplat comments on Decision theory: An outline of some upcoming posts - Less Wrong
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It seems to me that what SilasBarta is asking for here is a definition of shouldness such that the above statement holds. Why is it invalid to think that the system "wants" its physics? All you are indicating is that such is not what's intended (which I'm sure SilasBarta knows)...
As far as variational principles go, one difference is that a physical system displays no preference among the different local extrema. (IIRC you can even come up with models where the same system will minimize (an) action for some initial conditions and maximize it for others.) This makes a Lagrangian-style physical system a pretty poor CSA even if you go out of your way to model it as one.
CSAs can't escape local optima either ... unless you found your global optimum without telling us ;-)