LEDs can allow more build up, but when it's well below freezing and you are moving along standard headlights don't really create enough heat to keep things melted either.
I lived in Houghton/Hancock a while, and none of the various trucks I owned while there were immune from sometimes needing the headlights cleared. Always great being in the middle of "the Seney stretch" at midnight in a 200,000 mile Toyota beater and realize you're headlight output has slowly degraded to about 10% of full power. Luckily it's typically snowing hard enough that you can't see crap anyway. Down here as a troll now it's normally slush kicked up by other vehicles that cakes headlights.
With any style headlight, short of models with a heater grid in the lens, the best bet for keeping them clear is using car wax or a rain-x for plastics type product so as much snow and slush as possible will slide off before sticking and gathering more.