The bottom line is that anyone in any sport is probably going to use, in competition, the highest performing equipment allowed by the rules. I wouldn't expect a golfer to go into a tournament with a niblick, a mashie, and a spoon. In a practice atmosphere there's really no justifiable use. As to any idea that a kid who can swing a -3 should do it all the time even when a bigger drop is allowed, I've never had a kid who had any trouble going back and forth between the two.