I also felt the same as loeg after finishing the article. If you simply state that invalid states cannot be handled, I believe most people here would concur. An

I also felt the same as loeg after finishing the article. If you simply state that invalid states cannot be handled, I believe most people here would concur. And in the end, I do think that this is a very significant insight that you describe. But using a narrow definition of errors to mean invalid state disregards any prior literature and programming manuals that already talk in terms of "error handling" and asks readers to suspend all of that while reading the article.