http://bleacherreport.com/articles/2626766-nfl-competition-committee-ann...

The elimination of the chop block could affect a number of offenses, as many teams had incorporated it as a staple of their running games. But many defensive players decried the chop block as being a dangerous play that put them at risk of injury.

Meanwhile, the other most notable change—the move of the line of scrimmage to the 15-yard line for try kicks—comes as little surprise. The longer extra-point attempts made the play more compelling in 2015, as kickers missed the most extra points since 1977, per NFL.com's Conor Orr. 

The change added more strategy to the game, as teams were more inclined to attempt two-point conversions if their kickers were struggling or if the weather conditions made converting field goals difficult.