Yes, you are right. There is absolutely no biological, societal or familial pressure on young adults to have children in their 20s and early 30s.Having Kids is a choice. If you choose to do it than you cannot turn around in the same breath and sook about housing prices. Everyone knows having kids is just about the most expensive thing you can do, outside of buying a house. Having kids is not an excuse to not being able to save for a house deposit.
If you want to own a house and you cant afford kids then don't have them.
Me and my wife deliberately waited until after we bought a house before we had our daughter, so we cam maximize our savings for a deposit. that's a choice we made.
This has nothing to do with "sooking" (I have my own home), I just don't think it is an ideal situation that young families should need to choose between starting a family at the optimum age biologically and saving for a house deposit.
I also don't think that is ideal that those earning less than the median wage, even if they budget, should be locked out of homeownership.