My guess is that there are multiple factors: * Not invented here syndrome: 10x coder may code small things himself that many times is faster then learning othe

My guess is that there are multiple factors: * Not invented here syndrome: 10x coder may code small things himself that many times is faster then learning other stuff. * Selection of the tools to use: it will use Ruby instead of Java, for example, and for a reason. In general he'll try to figure the fastest path to solve the problem so will try a lot less.