Things go in cycles. The last several years the theme in the SEC was "it's a defensive league." Now, the offenses are better than the defenses.
I just think it ebbs and flows...that's just my opinion.
Just look at Tennessee, Florida, Georgia, Arkansas, Alabama, and Auburn. None of those teams would put defense as the strength of their teams right now. But it wasn't many years ago that most or all of them had excellent defenses to rely on.