Nietzsche is a very interesting example since there is a very obvious shift in his philosophy from The Birth of Tragedy to, say, The Gay Science. I understand the argument that the style of writing noticeably changes, and I'd be okay attributing that to "automated writing," but a lot of the shift in Nietzsche's work feels like a pretty drastic shift in ideology. I'm not convinced that shift entirely, or even largely, comes from the shift in medium.
I wouldn’t consider it a shift as much as a development- he kept landing on new ideas that built on his previous ones.
Focusing on his writing style rather than the ideas themselves feels a bit like bikeshedding to me. He claims he would come up with most of his ideas on walks and only later sit down to write about them- the process, according to him, was not central to the development of the philosophy- only the surface level presentation of it.
