It's all down to the design of suburbs. Many cities have bylaws and zoning regulations that prohibit human-centric suburbs from being built [1]. Older neighbourhoods (prior to these ill-advised laws) are incredibly livable and naturally produce a sense of community. They also feature mixed-use zoning with quaint little corner cafes, restaurants, and small shops. These are incredibly important as third places [2] which have largely disappeared from our society.

[1] https://www.youtube.com/watch?v=MWsGBRdK2N0

[2] https://en.wikipedia.org/wiki/Third_place