The slam race has driven some people out of control. It has made them losing every sense of logic, of appreciation of greatness, of enjoyment of tennis. It has built a lot of resentment, anger, bitterness in some people. It was particularly special because the 3 main contenders (Federer, Nadal and Djokovic) played each other for almost 2 decades, 149 times.
Some players were crowned despite the fact that race was still ongoing. Imagine the pain of losing the crown while still being active.
The other ATGs before the Big3 lost their important records after they had retired. Federer and Nadal lost their records when they were still playing. This leaves lots of wounds and scars amongst their fans.