What do you think?
Consider the amount of processing power, time, and manpower would need to go into creating a physics-based snow avalanche--for no neccesary reason. It would be cool if they had tornadoes and earthquakes--but I can tell you right now there won't be any.
It's funny. If there would be a topic about dynamic snow BEFORE we found out about it, I bet people like you would also comment "too much power, resources, unnecessary, waste of time".
It's a bit contradicting, is it not?
It's sure as hell a necessary reason to have avalanches just as to increase immersion, gameplay, graphics or anything else. It seems many here on these forums seem to be stuck in a 5-year-old way of thinking that is attached to Oblivion's Gamebryo engine, completely oblivious of today's development in technology.