I'm surprised you didn't put can save a failing relationship on the list. Many of your reasons assume a level of success when it comes to financial investments, making connections with rich or powerful people. You also assume children will like their parents well enough as adults to want to take care of them financially or at the end of life. Moreover on end of life, care has become more complicated as lifespans grow so even a willingness to take in an elder parent may be outstripped by the parent's needs. The labor argument doesn't apply here on reddit as most of us who are active on the site live in post industrialized countries. Economies of scale would be hard to achieve given the rising costs of health care, child care, and education. I suspect that doctor bills and college tuition will be much higher for the seventh child that all the hand me down clothes and toys really can't balance that. Even if achievable, the cost of raising enough children to see that savings would be a barrier to entry for most families. Finally on Fecundism, this does not necessarily hold. Take issues slavery and the Civil Rights Movement; plenty of people wanted to hold on to slavery and later segregation but enough people in younger generations broke with their parent's values to make a radical change. We see the same thing with marriage rights today.

Nobody is saying these things are certain definite, like you seem to wrongly think.

Bringing a person into the world isn't about how they serve or benefit the parent. It's about helping a new person become as independent and self-sufficient as they can be.

Lol, this is such a white, middle class thing to say. In your little fantasy world everything is about "unconditional love" and "independency", but in the real world there are a hell of a lot of selfish reasons people might want kids, not all of them necessarily good or altruistic.