@ Eric
I would worry more about the design and construction of the shelter than the fabric. I have used a CF MLD Duomid for snow camping for the last 3 plus seasons. (The shelter is also used in summer, spring and fall).
“Is it very stiff and hard to pack when cold?” In winter, the CF Duomid is not any stiffer or harder to pack than in the spring or summer. It does take up more room in my pack than my Silnylon Duomid.
“Is it noisy in windy conditions?” I have not been bothered by any noise.
“Is it more fragile when cold?” It is not more fragile at lower temperatures. In the face of wind, I would think that the seam construction, tie outs, pitch and anchor points matter more than the fabric.
“Adhesives failing” Nope.