Videogame speed running has this problem solved. Livestream your 10x engineer LLM usage, a git commit annotated with it's prompt per change. Then everyone will see the result.
This doesn't seem like an area of debate. No complicated diagrams required. Just run the experiment and show the result.
You could say it is a lack of imagination or not connecting the dots, but I think there is a more human reason. A lot of people don't want the disruption and are happy with the status quo. I'm a software engineer so I know how problematic AI may be for my job, but I think anyone who looks at our current state and the recent improvements should be able to see the writing on the wall here.
I for one am more curious than afraid of AI, because I have always felt that writing code was the worst part of being a programmer. I am much happier building product or solving interesting problems than tracking down elusive bugs or refactoring old codebases.