I don't think the offenses have changed much to be honest. There are just more offenses doing what Peyton Manning, Tom Brady, Drew Brees etc led offenses did: Spread teams out and pass more. It's the changing of the guard and scoring will dip as those QB's retire.
2018 is a mere .8 PPG higher than the 2013 season. 2017, scoring was down to the lowest since 2009 at 21.7 PPG, a full point lower at least than the previous 3 seasons.
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