Also, I lived off the grid for fourteen years, and my legs got nice and strong from deep squatting over a hole, every day. It is not a hardship, except for I would be putting up some visual barriers around the 'long drop'. Some bagged lime is also nice, to keep down the smell, but I guess freezing conditions will help with that.

Some camp grounds on the East Coast of New Zealand have them, because there is no running water in the sand-dunes.

In the bitter cold, one would prolly try to roll the thermal underwear just enough, and have a hot water bottle ready to warm up one's behind afterwards...