First off, anyone with experience in serious ice, not common, with the experience of flying small to large planes...not common pretty much laughed when NASA came out with their icing research.
Jet pilots flying back and forth over the Cascades, my stomping grounds, talking about how 'bridging' is a fallacy, that newer boots deal with that, on and on. It was a complete joke.
Simply put, 99% of the planes out there don't have the newer designed boots, nor do we fly jets that zip us through the upslope ice with 1 minute of exposure whilst accelerating through 250 kts.
So forget the jet guys, or the NASA guys, or the airline guys and what they think about ice when all they have to do is hit the boot and push the throttles forward to deal with icing.
IN the rest of the world, you have to live at 14,000 feet with boots that don't work that well, pushed by little vacuum pumps. You can't climb out, accelerate, or just turn around and spend another hour going back through the place you accumulated the ice to begin with.
That said, in a forum full of guys that purport to know what they are talking about, I can assure you that tail plane icing is so stupid real, when you have an aft CG on climb out with up slope icing on all over, the difference in the climb was 500ft/m vs 0 Ft min with mountains looming, by simply getting passengers to move to a more centered location. So yeah, tail plane icing is THAT real.