I agree. There are good reasons to want to live on a street that doesn't have a lot of traffic. (That doesn't equate to a cul-de-sac, although they trivially fit the pattern because there is only one end.) One of the problems with the street layouts described here is that pedestrians have to follow the same winding routes that the cars do. Another is that the larger, heavier-traffic roads aren't nice to walk along, even if they have sidewalks.