From what I've gathered in the article, a one-way front differential is advantageous if you prefer to brake to initiate the drift (like using the e-brake). This maneuver puts the braking force to the rear only and swings the rear end out easier. During acceleration, all 4 wheels provide traction. I think the effect is similar to having a rear-wheel car when drifting is in effect.

You get the best of both worlds (rear wheel drive) drift characteristics with 4-wheel drive traction on a AWD car.