Hossenfleder is a critic of the idea that the “beauty” of a theorem is a useful guide to it’s likely success. She makes the point several times in her book but, in reality I would say she’s not so much interested in the ‘aesthetics’ of theory as the uncritical worship of mathematical “beauty”. It’s the screwiness of thinking that beautiful math is somehow cognate with “truth” that pisses her off. I must say, as someone who feels the same way about “mathematical” economists, I am sympathetic with that view. She argues that it gives energy to essentially un-falsifiable theories such as the excesses of string/multiverse theory that are in her view intellectual onanism (“wanking:” in Australian english).