Hi. “Topically narrow” could particularly mean that the theme is ok to design showcases like creativity showcases (e.g. portfolios), and a lil complex for personal blogs and other business due to its composition and usage of negative space. That’s uneasy to achieve in context of a company website for example. Such approach fits designing with “sophisticated” media content along with talented texts (and storytelling) to create great overall look according to gestalt harmonies and relatively average functionality.