I'm not sure I want to, because I vaguely remember being downvoted for similar comments in the past.

But what I am referring to with "nature vs. nurture" is that you can't separate them. Take away the physical basis of a person, all the DNA, and there would be no person. Put a newborn in a box, i.e. no nurture, a person would also not develop. So you can't assign a fraction to either one.

Similarly, there is no separating randomness from selection/merit, in my opinion, because the latter acts on the former and both pervade everyone's life.

That is what I mean by a false dichotomy. It's not just that life involves both randomness and selection, but that they are not opposed things.