I suppose yes everything is relative; if you live in the likes of Norfolk with norfolking chance of an incline I do agree you could probably last the winter without 'assistance' be it chains or dedicated tyres.
A couple of posts seemed to reference a persons driving ability and experience can surpass the effectivity of snow tyres and I'm sorry that's complete and utter bollox.
I am sure many on here would be insulted (me definitely) about reference of being a better driver than others, unless I have gone wheel to wheel in identical kit in identical conditions but I too have 30+ years behind the wheel in all manner of conditions and vehicles.
I have been places and done things which would impossible without the right equipment (snow tyres sometimes being the right equipment) and have almost peed my pants in laughter whilst passing many skilled drivers exhibiting zero traction.
My wife is a self confessed nervous and relatively unskilled driver but can easily and in relative safety (bar other drivers) traverse the -125m to +220m climbs on her 4.5 mile trip to work, passing all manner of cars with summer tyres along the way.
I live on the edge of the Pennines, infact our house is up a windy half mile climb up 1:4 cobbled incline. So whilst I could happily visit any of your houses in a modest snowfall, I can assure you with more than 10mm of snow covering you would not be visiting mine on summer tyres (4 WD or not).
Aside from my current abode though I have run snow tyres in this county for the last 20 years. I value my life, my families life and my cars more than I value to money to get kitted with winter tyres. I also enjoy the four fold ability snow tyres bring over summer tyres below 3 deg C and I usually keep them on about 4 months of the year (and temper my fair weather driving to suit their reduced limits above 7 deg C).
So I do accept some may be able to live through a winter here in the UK without changing tyres, as for me and the wife we can get most places that ground clearance allows in winter - namely home.
I too am a very able driver but I am not a gambler - The right snow tyres make a massive (I would say 4 fold) difference to winter traction !