A down top quilt, like an Enlightened Equipment Revelation, weighs 1 pound, is breathable, very packable, and can go very, very cold. Not a good idea to get it wet (though I think the down is hydrophobic treated), but I just keep a garbage compactor bag in my pack and all of my "don't get wet" stuff goes into it.
I'm sure the wool is functional, but I think weight and packability count for a lot. I don't bring wool blankets for the same reason I don't bring a full set of cast iron skillets.
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