Strongly agreed, and it's also worth it for those who think too narrowly along those lines that those aren't even the same axis. I used to be single and childless, and my happiness fluctuated a lot, but now I'm married and much more consistently happier. Neither my wife or I want kids, so if we had them, suddenly we'd be back to being less happy again. There are also plenty of single parents, and I'm sure many of them are happy and fulfilled without needing a partner.

Plus, kids who grow up with parents who are unhappy and would prefer to be childless are probably a lot more likely to grow up into unhappy adults.