thats not true for different players in some level-or-not playing field
But I’m glad you had a chance to feel like a clever little boy
Selection pressure rewards successful genetic reproduction.
What actually happens at the scale of the organism is mostly irrelevant except how it affects reproduction.
A genetic predisposition towards chopping legs off would be selected for, if chopping legs off resulted in more children than otherwise.
Chopping legs off after having no more children (e.g. after menopause or vasectomy) has no direct genetic outcome (instead indirectly via improved/worstened reproduction of children or relatives).
To be clearer: reproduction is the key (survival matters for reproduction and upbringing).
That's a good summary, although the details are sublimely trickier. https://en.wikipedia.org/wiki/Gene-centered_view_of_evolutio...