Strong is only relevant in relation to strength to weight. Then the question is strength of what, strong pecs and triceps would only matter if you plan on pushed on the rope. I believe lower body strength is what really matters so I emphasis working my legs heavily and putting miles on my bike, and playing racquetball.
However, often strong individuals learn to ski and try to harness their strength to the deterrent of their body position, handle control and edge change. The scrap and crash, and then repeat.
The ideal scenario is to learn how to ski properly and then get strong, like Bob LaPoint, running short line when he was a skinny kid and then growing up, I expect that is what will happens to Charlie Ross as he matures.
A good regime of conditioning and strength training, may improve one skiing performance but more importantly should greatly reduce the occurrence of injury and if injured, reduce the severity and lessen the recovery time. So there is a utility for bench press, but I see too many making that a priority and neglecting all other muscle groups. Alas, I spend a lot of time in the weight room and cant seem to get any closer to Adam Caldwell’s physique, or skiing either.