First, that isn't the right quote. I believe it was "I hit homeruns when I need to." Regardless, in 1925 at the age of 37, he told the media that he was going to try and hit homers the next two games and he got 5 of them in those two games, a record which stood for a long, long time. So he was obviously capable of doing it. But I guess that isn't the point here. The question is whether he would have hurt or helped his team more by swinging for the fences. I think considering the era that he played the majority of his career in, with its loose ball and huge dimensions, he would have helped his team more by slapping the ball around and getting on base than trying to hit home runs, which would probably end up as fly outs in those days, resulting in him getting on base fewer, which is surely lowered his effectiveness and value. We aren't talking about some beast of a man here like Mark McGwire. This is a guy who dominated the basepaths and stole home 49 times. It's not like the guy didn't slug the hell out of the ball though. His career OPS+ is 167, which is ninth all time.