I'm not sure if chopped corners area a required feature of Super Blocks but man those are annoying zebra lines... You have to walk 10 meters more to use the zebra line on each intersection!
https://en.wikipedia.org/wiki/Pedestrian_scramble
And I thought 2nd paragraph from Wikipedia offers an interesting insight on cultural priorities:
> It was first used in Canada and the United States in the late 1940s, but it later fell out of favor with traffic engineers there, as it was seen as prioritizing flow of pedestrians over flow of car traffic. Its benefits for pedestrian amenity and safety have led to new examples being installed in many countries in recent years
Unless you are trying to cross perpendicularly, then you have to walk 10 meters less. Averages out to being similar (and isn't annoying to use in person).
Regardless, it shortens the crossing length, and puts crossing pedestrians at a perpendicular angle to turning drivers, both of which drastically increase pedestrian safety.