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 tha

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.