The groomers don’t do anything to get the heart rate up. That’s the issue. At least if there are moguls the exercise gets blood flowing to the extremities. You finish a groomer and you’re just as cold if not colder as when you started.
I could/would ski on a day with temps like tomorrow, but only if I could get into the trees, where it’s somewhat wind protected and I’m working up some heat internally. Bombing down groomers at 40 mph when the wc is -30f, is no bueno.