To explain our rationale at this point: We discussed in this section studies, that have as well measured expected usability before use (like presented within the theory section). If I got it right, that was not the case in Rigutti et al., 2015 - but correct me if I am wrong. Thus, our idea was to focus on such studies; we were aware that there are several additional pieces of research available for the connection between post-use usability ratings and objective measures (for an overview, see Lee & Koubek, 2012 as cited in our paper). From my point of view, it is ok to narrow the focus down in such manner within the discussion section. Otherwise one might ask as well why for example research like Tuch et al. (2012). The role of visual complexity and prototypicality regarding first impression of websites: Working towards understanding aesthetic judgments. International Journal of Human-Computer Studies, 70(11), 794–811. doi:10.1016/j.ijhcs.2012.06.003 is not discussed in Rigutti et al. 2015 when talking about first impressions in their discussion. But I am sure, that is founded in the focus and storyline of this specific discussion section.