Yeah, that's nonsense, or at least it is if you're talking about a system of significant complexity. Some simple greenfield app with a couple KLoC might not be

Yeah, that's nonsense, or at least it is if you're talking about a system of significant complexity. Some simple greenfield app with a couple KLoC might not be complex, but most systems are hundreds of thousands if not millions of lines of code. They probably use HTML, JavaScript, CSS, Sql queries, a dozen or more libraries (which are also complex) on top of the actual core code. Inconsistent patterns and legacy code are also present, and you need to have a decent understanding of whatever domain you're working in. Just with that level of complexity, you need a unique attitude and problem solving ability that many people can't or haven't developed. You need to be willing to stare at a computer screen for hours, without quitting due to frustration or boredom.