There's something to be said about being efficient, but let's not pretend that strikeouts are a bonus. A pitcher can only control so much, and striking people out is the best he can do in that regard. When you start pitching to contact, you open up a lot of variables outside the pitcher's control. I'm not saying that you try to strike out every hitter, but when you have the stuff conducive for it(and possibly stuff/control NOT conducive to hitting spots and getting poorly batted balls), K's and power pitching should be the route taken. Striking batters out is a bonus because it gives certain pitchers another way to get an out (and as you say, an extra bit of control over the outcome of an at bat). While it's true that the pitcher can't control anything outside of the strikeout I think that a pitcher will do best to trust his defense. One could argue that good pitching and good defense are synonymous. In the case of the Cubs, I don't think many of their pitchers trust the defense behind them. It goes beyond defensive ability, into a lot of chance/luck oriented things with placement of the ball, type of hit, and positioning of defenders. The pitcher and defense have some control over these factors, but compared to a Three True Outcome(BB, K, HR), it's a big difference.