Two things, first, the optimized swing Gestapo has worked him over just like everyone else. The idea that opponents can observe, video, dissect and analyze that swing and devise pitching and defensive strategies to counter it did not occur to Mo’s wonks. Each bunt attempt is one less chance to barrel it on the sweet spot and obtain optimum launch angle and exit velocity. That same thing is also likely why O’Neill has a 30% K rate. Second, the game has evolved and he is unwilling to adjust which adopting a different approach would require.