One report I always look forward to every year is Football Outsiders offensive personnel analysis, where they break down usage and effectiveness of different personnel groupings in the previous NFL season.
In 2019 the Pittsburgh Steelers didn’t field the offense fans have grown accustomed to, with Ben Roethlisberger missing most of the season, the offense not having Antonio Brown playing a major role for the first season since 2011, as well as both JuJu Smith-Schuster and James Conner missing significant time.
One surprising thing to me was that in spite of the Steelers seeing a clear top three wide receivers on their offense, 2019 was the first time in years that the Steelers ranked worse in effectiveness out of 11 personnel (1 TE, 1 RB, 3 WRs) than from other personnel groupings.