Why isn't Steffi Graf considered to be the GOAT?

Steffi Graf, while widely regarded as one of the greatest tennis players in history, is often not labeled the "Greatest of All Time" (GOAT) due to factors like the dominance of contemporaries and the achievements of players in the Open Era, particularly Roger Federer, Rafael Nadal, and Serena Williams. Graf's career, though stellar with 22 Grand Slam titles and a unique Golden Slam in 1988, is often overshadowed by the longevity and consistency of these players. Additionally, the evolving competition and advancements in training and technology also contribute to the debate surrounding the GOAT title in tennis.