note that what you said doesn't quite contradict the hypothesis

Fair point. So let me just state that as far as I can tell, the average of my DWMM2M happiness is higher than it was before my child was born, and I expect that in a counterfactual world where my spouse and I didn't want a child and consequently didn't have one, my DWMM2M happiness would not be as great as in this one. It's just that knowing what I know (including what I've learned from this site) and having been programmed by evolution to love a stupendous badass (and that stupendous badass having been equally programmed to love me back), I find that watching that s.b. unfold into a human before my eyes causes me happiness of a regularity and intensity that I personally have never experienced before.