Are humanistic and positive psychology really incommensurate?

Comments on the article "The humanistic psychology-positive psychology divide: Contrasts in philosophical foundations" by Waterman (see record 2013-12501-001). Waterman has provided some broad-brush generalizations about differences between humanistic psychology and positive psychology, many of which do not hold in all cases, and he has pointed out some difficulties that would be involved in reconciling them. However, he has not presented any convincing argument that the two are irreconcilable. Essentially, Waterman has confounded difficulties with impossibilities by concluding these are incommensurate.