I think it's kind of rare to find a company that will promote you to "the senior levels of an IC" on just your technical domain expertise. I mean REALLY rare. At most places I've seen, you can get promoted on purely technical knowledge up to a certain level, but beyond that level, you're expected to show "leadership" and "influence" and "cross-team impact" and all that jazz. Same expectation of social skills as if you wanted to take the management track. So no matter which way you go, you ultimately plateau early in your career if you just focus on technical mastery.
Businesses are inherently social organizations, and at the higher levels, all require the typical bullshit that you though you left behind in high school: Schmoozing, smooth talking, brown nosing, political savvy, charm, confidence, cutthroat opportunism, those telltale "Ivy League mannerisms" that you see in every VP at your company. I learned this too late in my career, and it's really hard to pivot from "grumpy old man" once you become one!