If you have a 2WD? they're probably right.
My 2800 Edge will break both rear tires loose with just half throttle on clean dry pavement.
But in the Winter, I have to use 4WD Auto Mode (AWD) or it wont even move if the roads are icy.
If you have a limited slip and VERY good dedicated Winter tires, you might be okay, but you'll still need a soft foot on the gas pedal.
Murdered.. Lowered.. Alcohol Injected ..Blowered! 500WHP