The evaluation is a shades of gray spectrum. The dichotomy is where the bar is set on this spectrum during an instance in time.
Yes, I understood your original post. You concede that once evaluated, people are lumped into a dichotomy. I'm saying, instead of lumping them into a dichotomy, use a spectrum (most likely a discrete one). Super geniuses that are ultra-productive should have more children than people who are only productive and smart. People who are sociopaths should be treated differently (shot) than people who are merely lazy or who could be "fixed" (smacked).
If you consider this critique nitpicking, please resort to full blown ad hominem, not mere condescension.