You do realize, more than about pretty much any sport, baseball depends largely on natural reaction time? No amount of training, steroids, and parent's money on travel ball is going to help that.
His split between his BA and OBP was .098 for his career....that is insane. Certainly, he was infamous for swinging at sliders off the plate, but literally every player in history is infamous for struggling with some kind of pitch they chase. Braun was no different, Yelich is no different. Weeks is probably Top 5 in franchise history for plate discipline.