Some very interesting opinions developing in this thread:)
I've driven mostly rear wheel drive cars for many years, a mix of manual and automatic, and ranging from less than a litre to 5.7 litres. I've driven cars before the driver aids came out and with all the abbreviations under the sun. I've also driven four wheel drive and now own a front wheel drive. Over the years when the snow has fallen the roads have been more and more challenging. The main problems being pulling away, steering, braking and then tackling inclines both up and down. I have never got stuck apart from trying to get up to my road and up my drive. I have been stuck behind others, I have drifted when cornering and I have slid when braking. The worst of my cars in the snow were the IS200 and the IS250 automatic, I believe because the driver aids caused problems in the snow. The front wheel drive car I have now has been an eye opener, the only time it has had a problem was getting up my drive and as I bought a pair of snow socks I put these on and tried and successfully got up on compacted snow which no car has been able to in the past apart from the 4x4.
Now winter tyres. I haven't tried them but I have tried to get some steel wheels and winter tyres this year ( yes for a front wheel drive ) but failed at a reasonable price. The reason is that IMHO they would make the driving safer and I would be able to get up my drive. Stopping, pulling away, steering, braking and going up hills is important to me.
I'm not an expert, but am an experienced driver in all road conditions in England. I'm not a mechanic and I haven't driven in the Alps but one thing I know is that four winter tyres is going to make a car do what it's meant to do better.Not faster that doesn't matter. You drive to the conditions and, yes, in snow whatever car you have and whatever tyres you have you drive to suit those conditions. I don't care who you are by saying that winter tyres will not improve the safety and the likelihood of an accident shows you don't really know what you are talking about.
For others to say fitting two winter tyres is OK just shows people don't understand, don't listen to advice, don't care and don't understand the laws of physics or the electronic systems on today's cars.