That might be your experience but not mine. I have been luckily enough to work with really good people most of my career. For example, people I worked with who were good but not 10x went on to work for Google. So are you going to claim that 10x athletes, 10x business people, 10x chess players etc. doesn’t exist as well? And if not why would software development be the one exception from all the rest? Also, perhaps ask yourself why you desperately want it not to be true? What does that tell you about your own self-confidence/ambitions?