That's fair. But they should also be pointed out that if that is the measuring stick then Serena's competition during her career was far from JV BC.
.
Stefi Graf-22 Grand Slams
Maria Sharapova -5 Grand Slams
Venus Williams -7 Grand Slams
Justine Hennin-7 Grand Slams
Lindsay Davenport-3 Grand Slams
Martina Hingis-5 Grand Slams
Jennifer Capriotti-3 Grand Slams
Aranxta Snchez Vicario 4 Grand Slams
You could literally have made 3/4 of those names up and I would not know the difference.
Big difference between whoever tf most of those randos are and Larry Bird, Magic Johnson, Shaquille O'Neil, Charles Barkley, etc etc in terms of actual
athletic competition.
Yes. Undoubtedly.
You're making an equivalent argument to saying Amanda Nunes is one of the greatest martial artists of all time because of her resume, while completing ignoring that they faced demonstrably LOWER athletic competition than those they are being compared against.
To wit, the #1 name you cited, Steffi Graf, lost to the
203rd ranked male player in 1992.
You want to argue she's one of the greatest
female athletes of all time, fine, go nuts. But she is nowhere CLOSE to the Mount Rushmore of greatest athletes because she has faced nowhere near the same level of athletic competition, hence, JV ball.