I've never come across that as a "rule" in HS or college, but more the preference of the park. In HS it is a *****, since kids don't normally get asked to buy both. No one wants metal cleats on their turf. Just another thing... I assume this means our outfielders will have to wear rubber on the grass, which is definitely a negative. Metal cleats grab infinitely better than rubber on grass. I assume Adidas will provide our guys with both, since they'll be playing on both surfaces throughout the season.
Still very annoyed about a turf mound. That's a cardinal sin. Guys hit on turf all the time in cages and fielding on turf isn't a real adjustment. But, I can't understand asking your pitchers to adjust to throwing on both surfaces. There is a world of difference throwing when there is a dugout hole at the rubber and landing area and then you're pitching off a turf mound with neither.