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Bivvies are ok but not having a proper shelter in winter is asking for trouble and hypothermia.
Well, no.
People have been successfully sleeping in bivvy during winter, especially on the top of a snow covered mountain.

Having said that, you'd need more gears to stay warm which a tent end up being lighter.
edscoble
platypus
Get a tent.
Bivvies are ok but not having a proper shelter in winter is asking for trouble and hypothermia.