I have observed that a Staff engineer has mastered these three skills: Communication, Adaptability, Challenging Situation Management Normalize being just a really productive IC. Not everyone wants to spend their energy on these facets of a job; some folks just want to build awesome stuff -- and that should be fine.
Wanting to remain as technical as possible and be paid for your ability is valid, but soft skills will multiply your knowledge (and therefore value) across a team. In fact, I would argue soft skills are necessary to actualize your own potential as an IC within a team