“It’s probably not an overnight decision,” Tomlin said . “There’s a loneliness with leadership. I just thought it was a good time for me, personally. And by that, I mean just where I am in life. And I thought it was a good time for the organization, to be quite honest with you. We didn’t have a lot of success in the playoffs in recent years.” That last line is the one Steelers fans will sit with. Tomlin never had a losing season in 19 years as Pittsburgh’s head coach, an NFL-record streak that became central to his legacy. He finished his Steelers run with a 193-114-2 regular-season record, eight division titles, 13 playoff appearances, two Super Bowl trips, and a win in Super Bowl XLIII. At 36, he became the youngest head coach to win a Super Bowl at the time. But the second half of his tenure carried a different weight. Pittsburgh has not won a playoff game since the 2016 season and has not reached the Super Bowl since the 2010 campaign.…