I really hate that argument, because if you're here to have an actual conversation then the whole "you'll never understand until you x" statement is just you shutting the conversation down.

How about this: living without children at this time in your life where you currently have children is awesome and amazing, and you'll never understand how great it is because you have children. Yes you lived without children before but you were younger then, it's totally different now.

It's impossible for you to disagree with me, because you have no experience in this situation. It's just how reality works. Something something sensibilities.

So you can't have experience of having kids unless you have kids. This is almost along the lines of saying you don't know that getting hit by a car is bad, until you have been. I have plenty of experience with kids, my brothers and sisters have plenty. Not as much experience as a parent, clearly, but enough to know what I want.

Not the same. Getting hit by a car is physical and having a child is very much psychological and emotional.

Someone who's never loved can't say that love is overrated.

Edit: fixed typo

It's impossible for anyone to speak intelligently about living on the moon, because no one has ever lived on the moon?

It's impossible to speak intelligently about parachuting when you've never parachuted?

It's impossible to speak intelligently about being deaf when you're not deaf?

Hence my downvote.