I have no interest in the reproductive choices of other women. I've known women in every category you can imagine - and even I don't fall neatly into the "fell in love, got married and had children" box. Life often doesn't go to plan and there are many paths a person can take. None are more righteous than another.
However, if you're asking me whether being a parent changes you in ways that you can't comprehend before you had kids, then yes. I know childless people can pissy about hearing it being said, but as we're discussing the subject on this thread there's no point being less than honest.
Having children brings a dimension to your life that just can't be experienced in any other way. I've known a few woman in their 50s/60s/70s who are childless and they all have a unique selfishness, despite being very lovely people. When you have kids you have to put someone else first, no matter how annoying that might be at times. It changes you as a person and I think there are no other life experiences which are comparable. And yes, that old trope, but there's absolutely no love which comes even close to the love you have for your child. There are times when I almost regret having children because I'm now emotionally vulnerable in a way that I never was before. People say it's like a little piece of your heart is out there walking around, and that's exactly how it is. I had this conversation the other day, and a group of mums were all saying they felt the same.
But of course there is a flip side too. As a childless person you'll probably have opportunities that I'll never have. I could spend all day listing them. So you might be more rounded in other ways. You'll undoubtedly have the chance for many more exciting, fulfilling experiences that I can't even begin to comprehend.
The choices we make and the experiences we have in our life shapes who we are. And that includes having children too. It's silly to pretend that having children doesn't change you enormously, and alter your view of the world in a way that's impossible to understand unless you have kids yourself. But that doesn't make it the only valid choice - there are increasingly more young women who are deciding that their future doesn't involve motherhood, and no one should have to explain that to anyone else.