I like having additional lighting in the coop in the winter. In the middle of winter, when the nights are so long and the temperatures are so cold, a crop full of food has to last a long time. I like giving them more hours of the day to eat. When it's -20 or -30 at night and the highs are below zero, they need to burn a lot of fuel to stay warm.
If I lived farther south and the winter weather was better, along with the days being slightly longer in the winter, I wouldn't worry as much. The chickens would probably do fine either way. Lighting is just my preference. I light them even as pullets, even though they don't need it to lay. I also like them to have scratch before they roost, as coarser grains take longer to digest in the crop and last longer.