Meta-skills that nobody ever talks about

Some people are getting good at marketing, social media, and knowledge work.  It's seductive to go down this route. 

Others are getting good at communicating, connecting, and making a difference behind the scenes.  

The good meta-skills are classics.  Timeless and quiet.

The problem is, there's no way to measure them.  How do you measure clear communication, simplicity, or good design?  

The good meta-skills are never urgent, but they've never been more important.