I meant that he didn't think they were the best way to describe probability. IIRC, he thought that they didn't make it clear why the structure they described is the right way to handle uncertainty. He also may have said that they allow you to talk about certain objects that don't really correspond to any epistemological concepts. You can find his criticism in one of the appendices to Probability Theory: the Logic of Science.
Today's post, 0 And 1 Are Not Probabilities was originally published on 10 January 2008. A summary (taken from the LW wiki):
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