I thin you're reading too much into the coma scenes. But that's a pewrsonal interpetation either way.
They only affect white walkers in the lame TV series.
In the books, Martin makes clear reference to a smithing process similar to pattern-welded steel, which in its day was slightly lighter, and definitely stronger and holding a better edge. He has, of course, patterned in on Damascus steel, which for a long time was a closely-guarded Syrian secret. He even includes the fact that they can be reforged by ordinary smiths.