Some demands are exaggerated. But, having a house to be able to get married does seem to me like it should be a mandatory requirement for everyone in the world.
When you have children, children need their own space to develop, and if they do not have their own home, the decisions are not made by the couple, the space is limited so what the child wants to do at home will also be limited, for On the other hand, parenting is affected due to the various patterns it can acquire.
Personally, I don't see the point in getting married to live in your parents' house.