It's pretty fantastic. In 2020 (only just beginning my journey of recovery from a conservative upbringing), I decided I should understand what fascism actually was. I found that dictionary definitions were terribly imprecise but eventually found Eco's essay. I understand there are other methods--of similar scholarly integrity--used to define fascism, but I have not spent the effort to find and compare these other works. It is my (uninterrogated assumption) vague understanding that Eco's definition isn't regarded as opinionated.