The Steelers have allowed 171 points in their last four playoff games combined. They have given up 35 points or more in all four games and 40 or more in three of four.
Those numbers are historically bad as no team has had as many consecutive playoff games of defensive haplessness. The Steelers defense has been so bad in those games they made Baker Mayfield and Blake Bortles look more like Peyton Manning and Aaron Rodgers in their primes.
In any other world, the defensive coordinator in charge of a defense that has recently failed so often in the biggest games would have been fired. Heck, one performance like that in a playoff game in some circles is a fireable offense, and four might be enough to ensure a coach doesn't get hired as a coordinator anywhere else.
