Its more complicated. Even somebody who is a dead end- can feed back into a extended clan-family and thus enrich the survival of related traits.

And when you contribute to a societey that overproduces resources, thrives scientifically and does not carry a load of parasites, then your career actions may push the cohort fitness.

This of course implies that the offspring of dedicated focus personal has desert flower traits- meaning every offspring will be dumb as a rock, and pro at procreation. Meaning clever people will have "Hippie" pregnant machine offspring and the "spiritual" birth-machines will have hyper-analytical "dead-enders". None of them happy with the state of the world.

Life as they say- finds a way- to make you despair with the result of the affair.

It is far more complicated. I touched on the high level, but somebody in philosophy can write books on the subject (they probably know about many many books on the subject).