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Vladimir_Nesov comments on Post Your Utility Function - Less Wrong
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A simple utility function can be descriptive in simple economic models, but taken as descriptive, such function doesn't form a valid foundation for the (accurate) prescriptive model.
On the other hand, when you start from an accurate description of human behavior, it's not easy to extract from it a prescriptive model that could be used as a criterion for improvement, but utility function (plus prior) seems to be a reasonable format for such a prescriptive model if you manage to construct it somehow.
In that case, we disagree about whether the format seems reasonable (for this purpose).