This was aggravated by modern city planning with it's separation of function that left these new districts with no third spaces, barely any shops and large spaces of 'no man's land' between buildings.
In classics European cities there were shops on street level and dense blocks that generated demand for those.
The post war developments followed the 'high rise in the park' concept, lots of greenery and parking lots between buildings to create a mid density neighborhood.
But there is no life in the streets and you have to walk a lot through repetitive environment but to do anything you still have to go to the 'old city'.
High rises were far from being the only, or even the dominant model for social housing in Europe. Different plans such as low rises, semi-detached houses and single homes also got implemented.