Yeah, the 68 mm wide ski is an extreme example that illustrates the point. If the snow's 6" deep, there's no reason not to be on at least an 80 mm ski, and the only reason not to be on a lot of 100+ mm skis is that you might also on that same run end up on a firmer groomed run where a lot of the 100+ mm skis have other built in features that enhance their deep-snow performance (like softer flex and rocker) at the expense of their groomer-zoomer performance.
Thanks. That's why I said a "right" wider ski. Some carve almost as well, or as well, as a race ski. Some charge on groomers in some ways better.
So when that problem disappears on the "right" powder/chop ski, then what's left is optimizing the fun or not, maybe.
Also, due to lack of float and the right stiffness, etc. (and thus loss of some more fun options), I'm not aware of a ski below, say, 115, that has enough float, etc. to optimize shallower (and denser, and deeper) fresh snow, and crud. Even some of the best ones. And it's why to me, the best skis for over 6" even, any density, any degree of chop/crud, up to unlimited, are at least 110, and my tops are more, 117 to 120 wide. (But there are lots of others, I'd guess.)
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