I wonder if this argument holds less weight now that people in blocks of flats in some metropolises have less interest in interacting with their neighbours than decades ago -- in Helsinki for instance it is a faux pas to speak to one's neighbours, and some even claim that politeness demands you check through the peephole that the hallway is empty before going out, so you don't bump into a neighbour and make him/her uncomfortable. Plus, there must be a greater turnover of tenants these days due to study and job mobility, so why bother trying to build relationships.