Would they? Batting order is shown not to matter all that much, frankly. A true advocate would realize that, and then wonder, other than a few tweaks here and there, if there are other things to worry about, and whether or not the general "comfort" of not too much change is better. I don't know, but I'm not sure an advocate of stats would necessarily endorse tons of change based on the handedness of the pitcher. Also, since pitchers rarely pitch past inning 7 anymore, 28% of all at bats will come after the starter leaves the game. What if the handedness changes for the RPs?