Active steering in real life and the Active Steering in GT6 are two vastly different things.
AS in GT6, is more like a traditional Stability Control system in a way that it assists the car in maintaining control when cornering, but GT6 is adjusting the steering angle for you, where an SC system is using the throttle and brakes to maintain the control of the car.
For me, AS is still a fake aid that essentially fixes your mistakes.
I.e It sees that you've turned the wheel too far on corner entry, exceeded the lateral grip of the tyre which would result in understeer, and it corrects the steering angle for you.
On corner exit, it does the same thing, if you don;t steer enough and the car begins to oversteer, it turns the wheels for you.