Given the extremely poor access human beings have to the structure of their own concepts, it's dubious that the methods of analytic philosophy can trace those structures. Moreover, concepts typically "cluster together similar things for purposes of inference" ( Yudkowsky ) and thus we can re-structure them in light of new discoveries. Concepts that are connected now might be improved by disconnecting them, or vice versa. It is not at all clear that normative concepts are not included in this (Neurath-style) boat.