alt Hacker NewsI don't know which FAANGs you have experience with, but the companies and teams I worked for were very numbers- and impact-oriented. No amount of posturing and politics would help you at performance review if you couldn't show that you accomplished some goals and moved some KPIs that ultimately made the company money.
YMMV though - if you know people who managed to stay at a FAANG for a significant time without producing anything of value, more power to them.
In my experience, actual producing impact/value and being able to demonstrate that you've produced impact/value are pretty loosely coupled to each, and it is often possible to do one without the other (in both directions). And time spent on one often directly competes with time spent on another.
I'd imagine it's the people who are better at "demonstrating value" than actually producing it that are the target of the original post.