Good metrics don't mean you can play the game but bad metrics can mean you can't play the game at a certain level.
You have to be a good ballplayer first but there are more high school performers than there are D1 spots and experience is that certain metrics need to be reached to make it at a higher level, for example a 75 mph fastball on the mound or a 7.5 60 in center usally won't cut it at the college level even if your HS stats were good.