Just because he threw 20 interceptions last year, doesn’t make him a turnover machine.
Major League Baseball and the National Basketball Association have seen an influx of advanced statistics used by teams, analysts, and fans. While the NFL has definitely gotten more statistically inclined over the years, it would be naive to believe that it is at the same level as the MLB or NBA.
Part of that is just the nature of the sport. Baseball is very much a game where you are all but summing up a collection of individual performances. Sure, a pitcher’s ERA may be affected by their defense or the pitches that are called by the catcher.