#1 The playoffs

Believe it or not, NASCAR was once one of the only sports that didn't have a playoff system. In fact, for quite a long time, NASCAR just ran 36 races and crowned a winner based on points at the end of the year. Unfortunately for fans of the old way things were done NASCAR introduced a playoff system in 2004 and the sport has never been the same since then.
Things got even worse in 2014 however, when NASCAR announced that they would be going for a round based playoff system and that a certain amount of drivers would be eliminated at the end of each round. NASCAR also announced that the final four drivers would then compete in a heads up battle for the championship in an effort to keep the things interesting till the final race.
While this decision was a popular one for younger fans, it really rubbed traditional fans the wrong way and made a lot of them stop watching... Of course, NASCAR made the right decision to bring the sport into the 21st century and try to make the overall product more watchable, but did they have to do it in a way that angered their older fans?