If you were to log in, you'd be able to get more information on your fellow community member.
Accidental architecture, nothing intentional here. Lots got smaller. Narrower fronts mean you can fit more houses on shorter streets. More cars per household meant a need for bigger garages. Each a series of incremental changes for (limited) pragmatic reasons. Wander through tracts built in different decades, and the progression is clear.
Neighborhoods nearly sterile of social interaction are an accident.