All about the tyres. Check out bjorn nyland in his 2wd kona electric taking on the Norwegian winter. Car passed that test with flying colours. agree on the rwd bmw’s lol. Once got so stuck I had to be towed!
I’m no expert on EV’s, but I think I read that they do have an advantage in snow as the very heavy battery is in the bottom of the car and generally between the front and rear axles, so you get a good spread of weight in an already heavy car.
Whilst I love BMW’s, and the last 5 Series that I had was the closest to perfection of any of the several hundred cars that I’ve driven, it was cr@p in snow. Like you, I got stuck in a car park once!