In the early 1980's I watched 18U boys playing slow pitch softball and using the 11" ball. To me it would be like watching a whole tournament of "Rock Runs" playing each other.
I also got to watch a lot of great girls youth and see many players that went on play on Class "A" teams. USSSA did not have women's "Major" teams. "A" teams played qualifiers around the country to qualify for the "Women's Major World Series" and the remaining "A" teams played in the "A" Worlds.