Buster Olney posted this stat: http://www.fangraphs.com/leaders.aspx?pos=all&stats=bat&lg=all&qual=y&type=5&season=2017&month=0&season1=2017&ind=0&team=0&rost=0&age=0&filter=&players=0&sort=11,a Mauer has the best swinging strike % in the majors. In one sense there could be an argument that he should swing more, but I'm pretty convinced that he is absolutely physically cooked. By limiting swings, he is still, in some ways, able to maximize what he can do - as little as that is. I don't think he can make the adjustments people are calling for here.