Only the Cowboys have scored more points than the Steelers in the playoffs. 3 terams have given up more playoff points, even though two have played fewer games (Dallas, St Louis and Minnesota).
Only the Cowboys and Niners have won more Super Bowls than the Steelers, and only the Cowboys have appeared in more Super Bowls.
Seattle won 3 playoff games before this season... in their entire history... and none in the past 21+ years. The Steelers have won 11 in that same interval, and 27 overall.
One other thing about the Cowboys. They are THE ONLY team to have won a Super Bowl in every ten year increment. Super Bowls VI, XII, XXVII, XXVIII, and XXX. Dallas has nine shots to win one with XL-something attached to it.