Most people who are alive didn't get raised with as many children as the post I was responding to. Your point stands but is irrelevant to the post you are responding to.

Also, that argument ignores the fact that everyone with children at one point did not. This means we already know what it's like to assume what having children was like. We then also have the experience of actually having one. So when someone tells you it's different, they've already got the "no kid" experience under their belt and can tell you how successfully they extrapolated what it meant to be a parent in that life atage.