To the quote in the summary - might be because debugging dozens of layers of bullshit is hard. Anyway, debugging is about sitting for hours and reading logs and looking for weirdness, and looking at dumps, and what not. It’s a very different skill from “being the next Zuckerberg”. Also Zuckerberg is a psychologist most of all, his computing knowledge is not that unique. Network effect is more important than skill and knowledge here.