not lose games. The Steelers depended on his arm to win for many years. The guy has the most 500 yd passing games in history showing how dependent they were on him at times.
WikipediaIn the history of the National Football League (NFL), 19 different quarterbacks have passed for at least 500 yards in a single game 23 times, a feat also referred to as the "500 Club". Norm Van Brocklin was the first to do so in 1951, whose performance remains the league record for most passing yards in a game with 554. Only three quarterbacks have ever thrown for over 500 more than once in their career; Drew Brees and Tom Brady did so twice and Ben Roethlisberger did so three times. Brady is the only quarterback to have thrown for over 500 in a postseason game, doing so in Super Bowl LII. Quarterbacks throwing for 500 yards have amassed 13 wins and 10 losses by doing so, with 13 of the 23 total games occurring during the 2010s.
https://en.wikipedia.org/wiki/List_of_500-yard_passing_games_in_the_National_Football_League