Presuming aesthetic theory matches artistic practice is itself idealist delusion

Evidence

But it really is, as you write, `too broad’ and, precisely in this, too idealistic. This can also be seen, for example, in the fact that classicist aesthetics is assumed automatically, without the question even being raised of whether the way it was practiced by its greatest representativesI am thinking of Goethe, or Beethoven . . .corresponds to Herder’s Reflections [on the Philosophy of the History of Mankind], Kant’s Critique of Judgement or Schiller’s Aesthetic Education, and whether, precisely in art, the bourgeois rupture between theory and practice is not of enormous significance, i.e whether classicist aesthetics does not deny what actually happens in Elective Affinities or in the second part of Faust. The fact that Marcuse presumes that these are identical means that he succumbs to the idealist delusion; admittedly, it is then easy for him to demystify it. — Rolf Wiggershaus, The Frankfurt School, 243

Categorization

• XREF: Adorno’s charge that presupposed harmony of theory and practice is idealist connects to his broader critique of identity-thinking and of the administered reconciliation of reason with reality. — connects to: Romantic idealism located true reality in consciousness, elevating artists into prophetic seers — Peter Morey, Islamophobia and the Novel, 88; Idealist aesthetics identify form and content, not technique and plot; Theory and art must depart from context rather than dissolve into immediacy — Anna Kornbluh, Immediacy, or The Style of Too Late…, 325 (+4 more)
• yield-rescued: below the book’s yield-target cutoff, included anyway for connecting to: Romantic idealism located true reality in consciousness, elevating artists into prophetic seers — Peter Morey, Islamophobia and the Novel, 88; Idealist aesthetics identify form and content, not technique and plot; Theory and art must depart from context rather than dissolve into immediacy — Anna Kornbluh, Immediacy, or The Style of Too Late…, 325 (+4 more)