You don't necessarily need to own a home, but I think we'd agree most want to be in a good place financially before raising kids. Having a foot on the property ladder and living somewhere you can raise a family over the long-term is clearly part of this for most people.

You're right that couples could just rent a place and try to get on the proper ladder while trying to raise kids, but realistically I think most would want to do things the other way around. But to your point not owning a home is one of the compromises people who really want kids will be forced to make to have them today.