This was only meant to be an accessible introduction to Traditionalism and its peripheral relevance, and I guess that's what it succeeded in being. I still feel that there were areas that Sedgwick didn't give as much attention to, however, ones which I felt left an incomplete impression of certain things I wanted to learn about. Notably, other sources have suggested that Sedgwick has designated seven individuals as the most important Traditionalists. Of all of these, Mircea Eliade has by far the least coverage in the book, despite his relevance to both political and religious applications of Traditionalism (and both together, given that he considered the Iron Guard important to 'reconcile Romania with God', which also has relevance to the modern Radical Right), and the fact that Sedgwick gave a decent coverage of Jordan Peterson's connection to Traditionalism, apparently after having read the works of Eliade.
I'll come clean about my personal biases - as a secular humanist and metaphysical naturalist, I have very limited use for Traditionalism, given its critique of modernity is based on its declinist view of history, which in turn is based on an anti-positivist perennialism, almost deliberately not accessible to an empirical analysis. Nevertheless, I'm grateful to Sedgwick for presenting the Traditionalists and their views as neutrally as possible so I can understand the mindset behind these ideas. Perhaps it would have been wrong of me to expect Sedgwick to become more opinionated about the foundations given this - even so, the ideas adjacent to Traditionalism are ones that need their own deep analysis, and with this one of the few unopinionated books on Traditionalism, it felt like we were sometimes with a dearth of information. How much were the Traditionalists influenced by other declinists and pessimists? How did theology - particularly mystical theology - develop in response to Traditionalism beyond just interfaith and ecumenical discourse? I think we also could have done with more information on those who were opposed to and criticised the views of various Traditionalists, particularly as I feel that the attempt to blame modernity to 20th-century atrocities can almost count as a form of psychological projection, given that the foundations of fascism were laid by Romanticists and the Volkisch esotericist movements in Germany, and born of a nation-specific declinism.
Sedgwick does engage with the Radical Right's approach to Traditionalism in a very nuanced, effective way, pointing out both the similarities and differences between the views of, say, Guenon, Evola, de Benoist, and Dugin. And these are worth knowing - the lack of an explicit perennialism in de Benoist for example. But whether this discounts him as a Traditionalist is difficult to be sure, given that the fundamental nature of the perennial tradition differed among the Traditionalists anyway, as Sedgwick noted - Guenon seemed to believe that the West, especially Western religion, had little to offer, Evola saw monotheism as not perennial but a symptom of modernity, whereas Shuon conversely tried to argue for the importance of all religious tradition, echoed by Eliade but with a particular emphasis on Christianity in contrast to Evola's antipathy toward it. With this in mind, one has to wonder whether the focus on perennialism as defining Traditionalism instead of the anti-modern, anti-materialist declinism is simply hair-splitting, and preventing important connections to be made between the views of the Traditionalists and the related-if-not-always-directly views of the modern far-right.
Having said that, this wish for a different kind of book was definitely personal in nature, and for a brief, largely neutral (Sedgwick is no fan of fascism and neo-fascism at any rate, which I really don't object to) overview of this rather underlooked philosophical view, it's pretty good.