 The moral is that to evaluate the performance of your classifier it is necessary to specify the purpose for making the classification and even then good performance on your training data may not generalize. None of this is antithetical to coherence reasoning per se, as we are making comparative judgments and reasoning by dominance. But putting the argument in terms of coherence changes the objects of evaluation, moving from the point of view from the first person  decision maker to that of a third person decision modeler.