Commie blocks are great at that, and certainly better than nothing. They served their purpose really well when they were built, for example, and we can definitely learn from them. But still, quality of life wise, they really aren't the best. So with all the wealth we currently have, it should be easily possibly to create affordable/free housing that has all the benefits the original commenter demanded. I'd gladly take prefab mega buildings over people living on the streets, but when we get to choose and plan cities for the future, they shouldn't be our first option.