On very slippery roads, sometimes the only way to get started is to spin the tires somewhat...that's why they tell you to turn it off if you're stuck. As with any car, though, don't let them spin much, or you'll likely break something.
I have the staggered set on my car, but run winter tires during the winter...the smaller rear width may be the reason I can see it reaching the limits of traction on occasion, even when the roads are dry. It is rarer when I have the all-season set on the vehicle. It only happens when the car is just starting out, and that may partly be because at a stop sign or traffic light, the road tends to get more crud from the idling vehicles, but it does happen if you tromp on it.
FWIW, the tire pressure is within specs.
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above