Why almost all of my NFL watching is via RedZone. (though I have it as a bolt-on to my corded service)
It's definitely a different experience that immersing yourself in one game and loses some of that richness, but to say RedZone is just like Sportscenter indicates you're not really familiar with either.
The deep, tense, complicated, sophisticated overtime tie game the Cardinals and Seahawks played last Sunday was among the very best games of the past year but would have had near zero profile on Red Zone.