We talked about it last season, and we’ve talked about it this season, the Steelers are facing +1 defenders in the box a lot because teams are running single high safety defense against the Steelers a lot. For most of last year and this year, they are getting away with it because the Steelers aren’t making them pay enough for not having more defenders deep.
This has led to people claiming Roethlisberger can’t physically throw the ball far enough to exploit it. That isn’t true. He can still throw the ball far enough, there’s a different issue at hand here, and it is simply ball placement.