I think you missed the point. It takes more time to write English prose than to open a file and just fix it, so unless the time the LLM needs is somehow negative, it's not going to be faster.
I'd be curious how one gets to the error rate where they don't think they need feedback loops. Anyone can learn to touch type because the physics are deterministic and can expand from that to touch edit in something that isn't hopelessly WYSIWYG only.