[badpun]

This. One trivial example - people used to cook their meals in my country, which meant that you sometimes found yourself lacking some basic ingredients (like flour, salt, sugar) and just borrowed them from a neighbor living on the same floor. Now, as people more people eat out or order, this has decreased significantly.

Another thing is children activity - when I was a child, all children from my area were playing together outside all day (weather and school permitting), which resulted in parents knowing each other via various everyday interactions. Now, when people can afford to pay for extracurricular activities for their children, they just chauffeur them to their various activities and there is no parent community where the children actually live.