Hofmiller (1931) dismissed all the usual "main concepts" of Nietzsche's philosophy ( Eternal recurrence , Superman , Will to Power , Masterly and Slave Morals, Apollonian and Dionysian) and came to the conclusion after a long analysis that Nietzsche's late philosophy was only to be understood against the background of his long-term latent mental illness.
He was involved in some controversy with Elisabeth and arch-Nietzschean-nazi Alfred Bäumler, but died in 1933.
He notes in summary:
What is left of Nietzsche? It remains enough. The remnants are better than a System that never existed
There remains the critic and diagnostician of the period. There remains, not in the German word usage, but in the French, the moralist: the miniaturist and outsider of philosophy, the aphorist.
The three medium-sized works remain the longest: "Human, All Too Human", "Dawn", "The Joyful Science". What will remain are "les plus belles pages", as the French call their fine selections.
What remains are details: observations, ideas, thoughts, moods, maxims and reflections insofar as they are independent of his supposed system.
The artist will remain, the poet will remain.*