 The Hong-Page model solidly demonstrates a general claim attempted in the disputed Weisberg-Muldoon model: cognitive diversity can indeed be a social epistemic advantage. In application, however, the Hong-Page result has sometimes been appealed to as support for much broader claims: that diversity is always or quite generally of epistemic advantage (Anderson 2006, Landemore 2013, Gunn 2014, Weymark 2015). The result itself is limited in ways that have not always been acknowledged. In particular, it proves sensitive to the precise character of the epistemic landscape employed.