I live in a snow belt state and have wondered for quite sometime why vehicles do not have heated tail light lenses. One would think insurance companies would be lobbying for them big time.
I own two GM SUV'* and in certain conditions to whole back end including the tail lights can get covered with snow.
Vehicles can be equipped with heated seats, mirrors, steering wheels, and rear windows and that'* fine but all that does nothing to prevent rear end collisions because the tail lights are covered with snow.
It does not appear to be a big technological issue to provide what I would consider a great safety equipment addition. IMHO