As you look around the majors, there are many teams that are bringing up young talent to see what they can do. There is no time like the present right? The Yankees have a chance to do the same thing with Pettitte missing four to five weeks with his groin pull. Instead, they stick with the mundane (and mostly unsuccessful) choice with Sergio Mitre. Nothing against Mitre, but the guy isn't much of a pitcher.
The Yankees could have given Jason Hirsh a chance or even more creatively, David Phelps. Phelps just got promoted to Double A and has pitched well there. It's not like he is a raw kid. He is twenty-four and pitched for Notre Dame. With his stuff, he would give the Yankees a lot more chances to win than would Sergio Mitre.
But the Yankees can be like BMW. Why mess with colors when you can make a million cars that are gray or slate blue?