Let's put it this way.
Gengis Khan was considered one of the best military commanders of all times, maybe the best.
The Mongols in the period they dominated Asia were virtually unbeatable.
However, if you could bring Gengis Khan and his army to present time (and even way into the past), just a small group of soldiers, poorly trained with modern weapons would decimate them in minutes. Times change.
Does it mean that modern armies are better than the Mongols? in absolute terms Yes, they would defeat them without a doubt, in relative terms, no.
Can you pair them, NO, that's absurd.
Would the mongols be as effective as they were in the past if the lived today? who knows? that's speculation.
As everything else, tennis has evolved, players now are faster, stronger, there are different standards, different technologies, for racquets, balls and training, there is more experience, it's accessible to a larger number of people, it's subject to a closer scrutiny by media and fans.
So, you can't guess who would win between Serena Williams and Margaret Court. if you have a young Margaret Court at her best and Serena at her best, I can tell you, Serena would probably double bagel her. Now, would Margaret adapt her game to current times? possibly, but speculating on that would be like to say, who would win between Serena and Justine if Justine had a Serena's type body.
So, as a game it's ok, but it's not a technical analysis, it's just that, a game.