To me the most valuable programmer is a full-stack developer
That's because of the type of problems you work with. I have seen a embedded programmer literally create over 10 million in value in less than 8 months by rewriting someone else assembly code. His code did error correction, and cooperative multitasking on a 32khz embedded system which allowed the company to avoid ripping out a lot of deployed hardware by added new capability's and fixing a range of issues relating to cosmic radiation flipping bits. (You deploy enough sensors and it's an issue.)
