He was not alone in that. It was a movement. The modern short story was structured by many writers all adding and taking away pieces of straw and mortar.
Subtlety, nuance, and paradox are all part of the modern formula.
As I said, he was a good writer. To me (as a professional and creative writer), what you define is a good writer, but not a great one (as Melville, McCarthy, Wolfe, and, yes, I hate to admit, Hemingway, too).
If people like him, fine. I would never try to take that away. I just don’t like the way several groups rise up as soon as a writer dies and (usually with an ulterior motive) start declaring him/her “One of the top 5 American authors.”