But it's not a matter of doing everything right, it's a matter of just how close to everything Seattle did wrong. On their 1st three possessions they got into Steelers territory and near FG range, on two of them they were sacked out of FG range. Having three possessions getting close and only getting points on one is bad. Then late in the half they had those two consecutive TD passes caught out of bounds, that's 7 more points they left on the field, I won't hit them for the missed FG on that possession since they wouldn't have kicked it at all if either pass is caught inbounds. Then you've got the final possession with the horrid clock management.
Really what it boils down to for Seattle is 3rd downs. In the regular season Seattle tied with Pittsburgh for the 2rd fewest 3rd downs in the league at 12 a game, and tied for 13th in the league in conversion percentage at 29.6%. In the SB Seattle was 5 for 17 on 3rd downs. They convert a few more of these 3rd down and they get those FGs. No they easily did NOT do enough to win if their "legitimate" gains and scores stand. None of the no points drives I outlined above had ANY flags thrown against Seattle in the final set of down, they failed on those drives entirely on their own. And those drives gave them the potential for more points than their margin of defeat. They lost the game because they failed to finish drives.
The Steelers level of play was so-so. The big difference maker is on the drives when they had an opportunity to score they finished, and finished with TDs. Seattle couldn't stop the big plays, and couldn't score when Pitt put themselves on the ropes for he first 20 minutes. The Steelers got to the SB by scoring early, Seattle had a chance to do to Pitt what Pitt did to Indy and Denver, but they couldn't manage to get the final 10 yards on those drives to get the points. They lost.
Will do know the Steelers won without the refs "help". A most of the calls Seattle fans are complaining about were 100% correct, B Seattle failed to score on numerous drives where they had the opportunity and the refs threw no flags and made no remotely questionable spots. That's how the Steelers won, because Seattle lost.
Its a big game. The refs should ignore penalties that may affect the outcome.
They only had one sort-of-a scoring drive, and even on that one it took a low percentage throw & catch on 3rd and very long. Then followed the QB dive "into" the end zone, after getting stopped on the runs. Your other two "drives" were the break-through-the-line run and the gadget play TD pass. Depending on those type plays to win in the NFL will get you few wins. Not without help. Sunday was a bad day for true football fans of the game.