So do you feel the same way about the NFL then? Or college or high school football? Or even relief pitchers? Are they really engaged when their side of the ball is off the field, or when they aren't being called on to pitch? Without being condescending, have you ever played football? When you're on the sideline you're often getting coached up or studying previous plays in that game. Regardless, NFL-MLB is an apples to oranges comparison. The core fundamentals of running, jumping, hitting, etc...you do whether you are on defense or on offense. As for relief pitchers, they are bench players, similar to bench hitters. The bottom line for me is that baseball is an offense and defense game. If you don't play defense, then you shouldn't play offense. I would much rather see an 8 man lineup than the incorporation of a DH in the NL.