For a society plagued with greed and overconsumption......
They sure did build narrow streets and modest single story homes. Even if we were take in-game world scaling into account people still seemed to have really tiny houses on the east coast while there was plenty of green space left to spare. if you compare the Doc's house in Goodsprings to the Sole Survivors in Sanctuary Hills it's nearly double the size if not even bigger, not to mention the homes in Sanctuary are meant to be cutting edge and new.
The only relatively big homes on the east side are the officer's two story houses with detached garages at Fort Hagen and Croup Manor.
I don't know something just feels off from what we're lead to believe via the lore and what we see in game world.