cars additionally turn at higher speeds with wider turn radii. Enterprise and Birchmount appear to have 15m radius corners, while downtown often has ~4m radius corners. The biggest corner I can think of downtown, Bay and Front, has a roughly 10m radius, and that is a noticably worse experience to walk across as a pedestrian.
That said, large freight vehicles do have to be accommodated in these suburban areas, unlike downtown, where they very rarely travel. 15m is unnecessary though, 10m could easily have sufficed.