As often is the case, cars are the elephant in the room. In the alley? We have rebuilt our urban spaces for cars instead of people. Now we wonder at what we've lost but have trouble connecting it to the automobile because t's ubiquitous and most of us can't imagine it otherwise.
Before there were cars there were horses. Some places are dense and cramp, the countryside is spread out. Talk of car cities or waling cities is mere confabulation. Some prefer dense cities, some the sprawling countryside of farms and having the nearest store an hour away. Why can’t people be free to live in less crowded, less crime ridden, less dirty and noisy locations if they prefer that?
Who says they can't? The question being asked was "why are there no nooks and crannies". Those by definition only appear in dense places. You can't have a nook in a large empty field.