Not just knowing what to program, but how - clever and mindful architecture will always beat clever programming.

Developing transferrable strategic and architectural skills between verticals (client facing, or technologies) is a key aspect that I see being missed with programmers.

No framework will make or keep your career, nor will a specific language or piece of tech. Knowing how to apply technology well, in a way that doesn't need to be entirely thrown away every 2-3 years is invaluable, and as a result increases a developers value.