ABS only works best on pavement. On loose surfaces (gravel, or off-roading) it's best not to have ABS because when the wheels lock on regular brakes, the small piles of dirt that build up in front of the tires stop the vehicle faster than with ABS.
On my '98 Dakota I only have ABS on the rear wheels (weird!) but I've never had my front wheels lock on pavement (wet or dry) though.
Cool vid though!