Hey JB....great post and thanks for your experience and honesty.
I do understand and can relate to what you're saying. Although my twin tip powder skis are 92 underfoot, they have a 17 meter turning radius and are very quick underfoot. THe skis actually can be carved using counter and tipping whether I'm on hard surface or powder. They come up on high edge angle very nicely. The other thing for me that I love is actually getting down into the snow and feeling the snow all around me.? Does skiing narrower skis require more focus on ski technique, I believe so. I've skied 75 underfoot in shin high snow and 77 in knee high, both more traditional skis and they were a blast to ski. Heck, I've even skied 99mm IN LENGTH Harts in Okemo powder.....where I did as much vertical doing somersaults as I did skiing.
Another thing I think of is that Harold probably weighs 145lbs and Diana is maybe 125lbs....so their "float to weight ratio" is quite different then heavier folks might be. My wife at 106lbs skiing her Kastle MX78's is good to go for neck high snow...yup....snork
le time!
For me, I've found my current powder ski Icelantic Pilgrims at my weight the perfect ski to blast powder and crud using many of the ski skills in my tool bag and enjoying every minute of it. I can also say that skiing a heavy wet powder is much easier on the body on a wider board? at least based on what I've experienced. Light fluffy snow....deep fluffy snow...just put anything on my feet and get out of my way...

I also think a little more float in glades is helpful in avoiding any lurking snow snakes ready to rap themselves around a sinking ski.
Is there a breakpoint in width underfoot where you loose that light feeling with your skis I think it's very arbitrary. I do know for me feeling myself sinking and rising in the deep snow, tipping and carving in the deep snow are sensations I can't get enough of.
Another 2 cents if you please...
G