A 4x4 with summer road biased tyres is just daft as is an 80/20 bias with no diff lock! Sadly whether it is a 4x4 or not the lack of sense and skill is what causes folks to look stupid (or get killed) when the whether is poor, not the fact they are in a 4x4.
A fair group of really great 4x4 drivers can be found at 4x4 Response, these are the guys that give up their time in weather like this to ferry nurses etc, help ambulance crews and deliver meals on wheels. A lot of these guys have this type of vehicle as they live in the middle of no where!
Part of the reason for taking the landy out locally is that if some muppet hits it they are likely to come of quite a lot worse (it's also fun in the snow, can't deny that!)