moonslav has said the same things repeatedly. But the simple fact is that the Sox have won 4 WS titles (and ended the 86 year curse) in the John Henry era primarily with terrific hitting and now and then pretty good pitching. Defense was always secondary.
And I'll tell you why, so pay attention. Hitting a round ball with a round bat squarely is extremely difficult to do--according to Ted Williams--and even harder when the ball is coming in hard with all manner of spins on it. And pitching, if anything, is even harder to do well because you are stuck with that miniscule rectangle, plus the tremendous effort it takes to throw that ball hard with the right spins, etc. Thus the advent of Tommy John surgery.
As for the defense, most of those plays are just routine grounders, popups, lazy fly balls, liners hit right to someone, etc. There are tons of good defensive players in the minors today who are just as good defensively as their MLB counterparts. They can't get to MLB because they can't hit, which is much harder to do.
Also, until this season, MLB teams were making defense even easier by using computers to predict where hitters normally hit grounders/liners/fly ball.