idk, have you checked Quora yet?
My mother says she never thought about it before having me, she was just going through the motions as anyone sane in this society does and then suddenly discovered that taking care of a child and seeing it grow is the most amazingly charming thing she has ever experienced in her whole life. She experienced a kind of love that's just overwhelmingly different that's just too different to any other, even the one she feels towards my grandparents. Watching me to grow up as a nice person makes her feel very satisfied, she also comments, it fillls a void.
So I guess you could argue that, in a way, the point of having children is to experience something that's out of the ordinary of whatever characterised your earlier life.