I understand the points you are making above and can see that they are backed by the data. I was clearly thoughtless identifying Australia as the opposite of England in terms of available land.
In England I believe that low rise apartments are a big part of the solution. Currently almost all apartments in England are one or two bedrooms, and additionally the buildings are aimed at the luxury single market. If planning laws made four distinct rooms at least 3m * 3m mandated in 50% of new build apartments then they would become viable for family living. After Grenfell it's simply impossible for England to use high rise apartments to solve this problem, but I have stayed with friends in Germany who lived in a block of large apartments on four stories in Saarbrücken and they seemed ideal and worked for them as a family.
In England I believe that low rise apartments are a big part of the solution. Currently almost all apartments in England are one or two bedrooms, and additionally the buildings are aimed at the luxury single market. If planning laws made four distinct rooms at least 3m * 3m mandated in 50% of new build apartments then they would become viable for family living. After Grenfell it's simply impossible for England to use high rise apartments to solve this problem, but I have stayed with friends in Germany who lived in a block of large apartments on four stories in Saarbrücken and they seemed ideal and worked for them as a family.