What you fail to mention is that Mount & Grounds don't have studs along the centre of the tire. They only have rows of studs along the outer edge of the tire and those studs don't touch the pavement unless the tires are run at low pressure and when leaning over and cornering. The centre studs are the ones which get most beat up from pavement riding and they will wear out if somebody spends a lot of time on bare pavement. Stud wear is usually not an issue for a recreational rider but it can be an issue for a daily commuter who spends a lot of time on pavement and often carries extra loads with them.