Also depends on technique and experience in deeper snow, especially soft snow out west. When I started skiing with my ski buddy who knew have to ski powder and bumps on straight skis in high school in the 1970s, there had to be a LOT of fresh snow for him to break out his 100+ powder skis. Another friend took a great pic of him in thigh deep snow at Snowbird a while back. I knew he was skiing his all-mountain skis that day because he thought the powder was already tracked out. I was on 112mm DPS skis that day because I needed the extra float given my skiing ability in deep snow at the time. His daily driver is 90mm I think.
I'm a petite woman and the all-mountain skis I bought five years ago are 85 underfoot. By then I'd become a solid advanced skier with the help of mileage and lessons. I use those skis in knee deep snow with no problem. Had a good time in thigh deep at Grand Targhee when it was really fluffy. Didn't own powder skis yet and didn't want to bother renting demo skis that day.
For skiing in the northeast, I would not want skis wider than my all-mountain skis. For that matter, I bought skis that were 78 underfoot for eastern skiing. Easier to turn and lighter to carry from the parking lot.