It's a skill that will get you out of trouble, allow you to do things others can't and because of that it might get you promoted which will get you hired.
In my experience, while what you say is true, if I were to rank the skills that "might get me promoted", there are far too many that are way higher than this.
Conversely, look around you at those who are at your "level" in the company, or at tech people who are higher than your level. How hard is it to find someone who does not use sed, awk, cut, etc?
I've always been a senior developer at the highest level at where ever I've worked. No one I've worked with over the years has ever used those tools. I do and it gives me an edge in response time.
But if you want to move up.
Everyone role above senior developer involves dealing with people/managing projects. Those skills get people promoted. More tech skills don't.
