Perhaps the people in these comments have had many programming experiences working with people who have great trouble coding, no matter how patiently we explain

Perhaps the people in these comments have had many programming experiences working with people who have great trouble coding, no matter how patiently we explain something to them. As a result, programming workplaces are often structured so one 3x programmer looks after a group of -0.5x programmers, cleaning up after them, while another group of 2x programmers are siloed off doing some real work, unencumbered by any -0.5x programmers and not threatened by the 3x programmer. This is the double hump in action. Despite working in these types of place, I still got a shock, though, when I started doing freebie work on open source software and worked out that such an aptitude-less programmer was managing a large open source project developing a programming language. Perhaps some people doubting the double hump are from places like Google where all engineers are vetted via Computer Sciences degrees, and they don't have repeated everyday experience of it.