There's no question that there are 15-20 families within 300 yards of my house. But that group of people absolutely does not have a sense of shared anything but the road.
And the fact is that this is true of the supermajority of suburban streets in the United States.
I don't disagree but 30 years ago the people in those kinds of neighborhoods did get out and talk to each other, did organize cookouts and other gatherings, and in general were sociable neighbors. The people changed.