I haven't done much winter camping, but for 3 season stuff, here are some exclusions. I don't bring a stove for most trips. The cold foods I find in the bulk section are more nutrient dense and somehow more palatable on the trail. Doesn't hurt that not cooking is easier and lighter. I don't bring rain pants or long underwear, just the pair of softshells and merino boxers I wear for the whole trip. For most multi day trips last year I didn't bring a windshirt. i have no problem with the extra weight, but I wanted to go as simply as I could and see how EVENT would do for me. I've also found for high mileage multi-day trips, I move at a slower than I do for peak bagging or bc skiing day trips, so its easier to keep a no sweat pace. It worked decent enough, but I'll probably start bringing my windshirt again for days when I'm having to do quick miles. No hipbelt, except when I'm carrying climbing gear. I tend to agree with jardine, that hips want to be free (or something like that).
Just for fun, stuff I do bring: headphones. I love music, I love hiking. Music + hiking is pretty good sometimes too.