My boys generally change their approach at the plate depending on the coach. In travel they are aggressive and will many times cut at the first pitch as it may be the best pitch they see. In HS ball, the coach will rip them for taking a swing at the first pitch as he wants to see them get deep into the count due to the limited number pf pitchers. That is his strategy. He generally doesn't chew on them if they get a base hit on the first pitch, but lord help them if they miss or roll over it. I will say that my boys have a hard time not hitting a grooved first pitch fast ball in HS ball. I have always encouraged them to be aggressive hitters no matter who they play for. Walks may improve their OBP, but to make an impression they have to be hitters.