Sometime between 14u and 16u coaches tire of girls watching good pitches go by into the catchers mitt. These coaches react by going nuts if a player takes a called third. Players then counter by swinging at everything thus driving down strike outs but also driving down on-base percentage.
Next to Runs scored and RBI’s, OB% might be the most valued aspect to evaluate a player value offensively.
Coaches should encourage players to be ready to swing at the first pitch (and every pitch), but to be selective until they get to 2 strikes.