Let's not throw the baby out with the bathwater. I agree that metricising performance is only as good as your metrics, and in my personal opinion, metricising knowledge work is a fool's errand (too many variables to accurately capture performance). That is _separate_ from having managers though. Managers can often triage work effectively, help engineers unblock their work, help identify people in the org that contain the domain knowledge necessary to help one of their direct reports, etc etc.
I think the whole urge to track velocity and points and stupid things like that to be absolutely dumb, though. Also I'm an IC and am coming up to the point in my career where I have to figure out a way to not be pushed into management.