[Peter_Spaeth]

Your logic would mean there's no such thing as a great pitcher who pitches to contact, or who isn't a dominant strikeout pitcher, because once a batter puts a ball in play it's all just dumb luck. That just does not square with experience. Did you ever watch Greg Maddux pitch?

Put another way, putting a ball in play on a pitch that was a hanging curve or a fastball with no movement down the middle is just not the same as doing so on a wicked slider two inches off the plate. A great pitcher can throw more pitches that are difficult to make solid contact with and thus your chances of getting a hit off him on a ball you put into play is not just random or some stat that will eventually hit the mean.