Earlier quoted context omitted.
I'm not even sure that coding _much_ faster than necessary is even required to give a 3-5x multiple on "average", let alone "worst case" developers. Some of the biggest productivity wins can be had by being able to look at requirements, knowing what's right or wrong about them, and getting everyone on the same page so the thing only needs to be made once. Being good at test and debug so problems are identified and fi…
All of the things you list are the product of the experience that OP is talking about. Anyone can get there with 20 years of (sufficiently rigorous) experience by ~40, but people who start as a child have a head start and it does show. It's probably especially obvious in the child-prodigy types because we as an industry have a tendency to force people out of IC roles by 40, so the child prodigies are the only ones wh…
The combination of 10-15 years of experience and the energy/time of 20s is very powerful.