"A key reason that Linux has succeeded is that it actively seeks to work for a variety of people, purposes and products. One operating system is now a strong player in the embedded market, the real time market, and the High Performance Computing market, as well as being an important player in a variety of other markets. That's a rather stunning success."
Conway's Law ...
... says that any piece of engineering reflects the organizational structure that produced it. Applied to the Linux kernel, with its high degree of modularity, scalability and flexibility, I think it reflects the modularity, scalability and flexibility inherent in open-source development processes.
Compare this to certain well-known large pieces of closed-source software, with their poor modularity, poor flexibility, and resource requirements that continue to increase exponentially with every major release...