I would also say your description of "very heavy snow" is an exaggeration.
Those ground observations you referenced are based more so around visibilities than actual snowfall intensity. With the powdery nature of the snow and the sustained winds around 15-25 MPH, it was pretty easy to accomplish persistent 1/2 (moderate snow) or 1/4 mile (heavy snow) visibilities throughout much of the event.
That said, I will grant that even DTX admits rates were up to 1" per hour in some areas, with the high ratios helping the snow to accumulate efficiently.
Again, as I stated, it was a nice storm for what it was (a widespread 12"+ snowstorm, for many the biggest of their lifetime). And as I also stated, there was definitely some blowing/drifiting. But let's not over-romanticize how impressive it was either.