What do you mean this revelation was recently demonstrated by Elon? The NATO Software Engineering Conference 1968 paper talks about the problems of having too many programmers of low skill. The 1969 paper talks about the same thing. Fred Brooks wrote the Mythical Man Month in 1975, covering this topic extensively. This has been talked about extensively for over half a century with regards to software, it wasn't just discovered by Elon in the last year.