Long-time C coders are among the best programmers around. It's hard to understand just how damn good they are until one has gotten a chance to work with one or more of them.
The good ones know all levels of the hardware and software stack they're working with. Coupling this knowledge with the raw power of C, they can put together amazing and resource-efficient software in very little time, yet without sacrificing maintainability, security, portability and the other factors you've listed.
These are truly the people who make the impossible become possible.