There only a few John Carmack and Linus Torvalds in the world, just as there only a limited number of opera singers compared to regular singers. The suggestion

There only a few John Carmack and Linus Torvalds in the world, just as there only a limited number of opera singers compared to regular singers. The suggestion is that 10 times programmers are much more common than that. This is a more modern scientific article dispelling the myth of a 10 times developer https://ieeexplore.ieee.org/document/8804291 https://ieeexplore.ieee.org/document/8804291