I think it is more about how to get to the trail head. In the US most people seem to take the car, in Europe people ride from home. This way you need taller gears for the way there and then a set of climbing gears.As far as ranges wider than 10-42, many riders don't need that, but it seems to be location (and rider) dependent. For example, many riders in yurp want larger gearing ranges than US based riders. Apparently their climbs are quite steep, bit they still want to be cranking wattz at 40mph on the way down.