what a load of rubbish. 4WD are usually considerably heavier especially when it's an SUV. so coupled with 4WD and the weight it's like normal driving compared to skating on ice with 2WD.
a 4WD even on a dry road is considerably better than a 2WD.
Interesting, so several years back now our FWD polo on Continental Eco Contact was significantly better than my 4motion CC running MPSS on a snow covered main road.
Why?
The Polo is light has small cross-sectional tyres and critically the weight is over the driven wheels.
The CC is heavy (weight is you enemy when running summer tyres), with wide tyres (you noticed how skinny snow and ice rally tyres are?), when the power gets shoved to the back because the front has limited grip you end-up with limited weight over the driven wheels, great.
I thought it was the MPSS so when the time came i swapped to Asymmetric 3s, same problems.
Having 4wd is not a get out of jail card when driving on snow, it can actually be worse especially when you are trying to slow down the extra mass of the vehicle.