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Not that I know anything about thermodynamics, but I suspect the Porsche recommendations (and they are not alone in these recommendations) have to do with the aluminum alloy block and heads, the viscosity of synthetic oils at low temperature, and maybe even the way the fuel mixture is maintained by the ECU.
Since aluminum transfers heat much better than a great lump of cast iron, I suspect the engine block and heads come up to operating temperature very quickly. Modern synthetic oils also maintain their pourability a very low temperatures, so there is less need to actually heat the oil a whole lot before putting the engine under load.
Computer controlled fuel mixtures and ignition settings also reduce the old problems of excessively rich or lean mixtures dependant on temperature, so engines just run better when cold than they used to.
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