For young pitchers who pitch inside against wood, it is much easier and most good pitchers have no fear of hitting the batter. The fear comes when you pitch inside and make a mistake, in college with aluminum, it's usually out of the park, that's why many college pitchers (even the best) won't rely on the inside pitch in the college game. Young pitchers who pitch inside and rely on it, will most likely not in the college game after the first few HR's against them.