Being exceptionally talented programmers does not automatically make them good language designers. I can think of a couple of people who may not be as good at programming, but are light years ahead at designing languages (and maintaining them over long term).
https://swtch.com/~rsc/
https://en.wikipedia.org/wiki/Ken_Thompson
https://en.wikipedia.org/wiki/Robert_Griesemer
https://en.wikipedia.org/wiki/Rob_Pike