I guess it's that I've always thought this is a misunderstanding of what Hemingway was doing. He wasn't trying to write simple language comprehensible to busy business people trying to get their jobs done. He was trying to write good literature as he saw it. Any alignment of the two things is accidental at best but often just a misapplication. He left things out in order for them to exist in the reader's own imaginative journey through the book; his spareness was a way of welcoming the reader into the story. That is not a good thing in business writing!