Yawn!
The problem still remains that very few pilots know what whiteout is. No it is not as everyone suspects flight in falling or blowing snow. For those who have never experienced it imagine flying along in the dark and flying into an unlit object that you obviously couldn't see. The same can happen in whiteout - it is so white or bright that your eye cannot differentiate. The worst situation is a flat overcast making flat light conditions.
All the instruments in the world will not help and are not a solution - a DC 10 in Antarctica proved this once. In flight visibility was in excess of 150 miles. White cloud base, white snow, white mountain no shadows - whoop whoop WTF...........
The problem will remain that unless you are aware of the phenomena you will not recognise it - simple.
You would have to ask why no less than 3 AS350's ended up lying on their sides in one day in Alaska - all from the same company. Instruments and instrument ratings is far from the answer.