Additional flourishes cost money. Keep in mind, that at the time these were built, these were generally meant as rapid responses to cheaply house large amounts

Additional flourishes cost money. Keep in mind, that at the time these were built, these were generally meant as rapid responses to cheaply house large amounts of people with basic living standards. After the war, most places had most of their housing stock destroyed, and whatever was left was also in high demand due to postwar baby booms, and for rapidly developing "Asian tiger" economies like Hong Kong, Japan, South Korea, rapid urbanization. When you need to house millions and your budget is paltry, aesthetic is one of the first things to get chopped. And for many of the people who would live in them, having a unit with its own running water and electricity, toilet, bath and kitchen was a significant upgrade, especially if their previous residence was a tin shack in a slum or a refugee camp.