The problem in soft sand is if your tires start to dig in, you can find yourself decelerating from jogging speed to zero speed in less than a second in the deep soft sand.
I used my Nomad Mk II for four days of vehicle supported mountain biking a few weeks ago on the White Rim Trail in Canyonlands National Park, Utah (USA). For that trip I bought a suspension front fork and cheap suspension seatpost, but otherwise my Nomad was pretty much "normal". I used Marathon Extreme 2.25 (57mm) wide tires. Of the 10 of us on that trip, everybody else used tires of similar width although everybody else used purely mountain bike tread on their full suspension bikes. There were several soft sand segments where we had to push our bikes thru the sand for hundreds of feet. Overall I think my tires worked just as badly as everybody else's tires in the soft sand.
A few lessons learned on soft sand:
1. I prefer SPD type bike shoes with cleats. I used Shimano M324 pedals, that allowed me to uncleat my shoes and still pedal the bike using the non-cleated side of the pedal. That saved me from several falls when I came to a sudden halt as my tires dug into the soft sand. Several others fell when they could not uncleat fast enough.
2. When approaching soft sand, once in it you have to keep your weight back as much as practical and let your front tire float on the sand. I use drop bars and have more forward lean than most people on mountain bikes where they sit more upright. Thus on my bike I had a center of gravity further forward than everyone else, which was a clear detriment.
3. In soft sand, keeping your momentum up is quite critical, once you slow down you dig in more and are more likely to suddenly stop.
4. I was the only one in the group with a Rohloff, everybody else had derailleur gearing. Thus, I could shift faster at slow speeds than anyone else in the group. But even with a Rohloff, once I was struggling in the soft sand, I did not have time to shift. So, if I did not pick a good gear going into the soft sand, I was stuck with a bad gear until I got out of it - and too high of a gear meant a greater chance of a sudden stop.
Although the Nomad was not full suspension like everyone else's bikes and I clearly had a weight penalty, I had a great time and was glad I brought the Nomad instead of renting a bike that was more appropriate for the trail. But on the roughest sections, it was a bit frustrating watching everyone else fly past me as their bikes soaked up the bumps better.