Here’s an article focusing on whether Roger Federer would have dominated in table-tennis like he has done in tennis. The people asked include former Newgy robot expert Larry Thoman (who I have dealt with) and he doubts that Federer would have been the GOAT in table-tennis. To be the GOAT in table-tennis, you have to defeat the Chinese which is a tall task simply by the sheer number of players they have and the volume of hours they train basically full-time from a young age. The Chinese players are supported by the government as it’s the national sport in China.
In Europe, although there is government support for sports, it’s not the same as in China and players who are not at the top often struggle. However, the World #2 and World #3 currently are Germans Timo Boll and Dimitrij Ovtcharov who have both beaten the top Chinese and were both recently ranked #1. The Swedes broke the Chinese dominance and challenged them for over a decade led by Jan-Ove Waldner who is considered the GOAT of table-tennis by many. He had incredible touch, was faster than he seemed, and had great anticipation. Federer has those same qualities but for sure does not mean he would be the GOAT in table-tennis.
The World Championships are going on right now in Sweden and it will be interesting to see if Germany or any other country can defeat China.