Lead changes have always been the best way to measure competitiveness. Setting aside Daytona where we are very beholden to the current rules package, lead changes are down this season:
Atlanta: 28 in 2016, 9 in 2017 -19
Las Vegas: 20 in 2016, 14 in 2017 -6
Phoenix: 7 in 2016, 15 in 2017 +8...