It isn't if you need to melt snow in an open area, say when stopping for a meal or when you're in an half-shelter.
I assume you really haven't done this much, have you?
I have melted snow as the primary water source for 11 years in the military, not just for food, but for drinking water as well. Back in the day we did not have a Thermos or the like, just our canteens.
Is it as quick as just boiling water? No, of course not. It is, however, way better than humping enormous amounts of water.
Indeed snow isn't as bad as most water sources, but it's still good precaution to boil it. You may dig a bit more but as quick overview this does the job:
Is that the same source as the previous one, that did the article on fishnet base layers? If so, they are really clueless. What he is stating is pretty effin' obvious. Avoid tainted areas? Really Sherlock?
Again, a tip to add some water to your canteen after drinking is to add snow and let it melt. You can also make a little ball of snow and stuff it in your mouth and let it melt, for drinking water as you are moving.
And great to know about 72celsius is all I need to kill bacteria.
You can thank Louis Pasteur.