2. 2020 season: 11-game winning streak
We certainly don't think about the 2020 season as being a historic time for the Pittsburgh Steelers. Ben Roethlisberger just returned from a season-ending elbow injury at the age of 38, and Randy Fichtner was the team's offensive coordinator.
Somehow, a slightly above-average Steelers team consistently took care of business. This resulted in Mike Tomlin winning his first 11 games of the 2020 season -- tying the previous record held by Chuck Noll and the Steelers team of 1975.
After winning 7 of their first 11 games by one score or less, their winning streak came to a screeching halt in Week 13 against Washington. Pittsburgh would go on to prove that they weren't as good as their early record indicated, as they finished the season 1-5. They followed this up by getting humiliated by the Cleveland Browns in the first round of the playoffs.
It's interesting that one of the best winning streaks in the history of one of the best NFL franchises came at the hands of a rather mediocre Steelers squad that didn't have much going for them outside of a good defense. Still, they proved a lot of doubters wrong in 2020 when they kicked off the season with 11 straight wins.