I think it would be helpful if people follow the trail of conversations and not just dive into a particular comment in isolation. My comparison of Federer and Nadal between ages 20-22 was in direct response to this comment by KINGROGER:
OK, the WTF has always been an indoor event, but that doesn't make it right. Times have moved on. In years gone by, tennis was very 'British' so they couldn't have an outdoor tournament in the winter, hence it being indoors. Nowadays, there are numerous places all over the world were the WTF can take place indoors.You should also note that clay and grass were the natural tennis surfaces for decades, hardcourt have taken over simply because they are easier to maintain.
Re your graph, you do realise that Nadal has hardly played a full season due to injury since 2012.
I followed the conversation. I see you picking the 20-22yo span of time to compare Federer and Nadal, point it to you that it's non sense, you tell me to follow the the conversation...
I don't see how WTF being an indoor HC tournament is wrong, since it's how you seem to think. As i said, it's not like it's new. Way back, most tournaments were on grass and pro tennis would use extremely fast wooden surfaces indoor. Racquets were made of wood, were very small. Players adapted to this, especially by rushing the net. But when they had to play at RG, they had to adapt and maybe play differently.
Nowadays, they play mostly outdoor, mostly slow courts, with bigger racquets and poly strings. Players adapted by grinding behind the baseline most of the time. When WTF comes, maybe they could just adapt a bit? And even WTF had a slow court for a few years lately. It's the same for Nadal and for anyone else.
Again, look at my point about Lendl or Sampras and tell me how it's different with Nadal and WTF? Oh yes, i know, it's just that your his fan and you think it's wrong that he didn't win everything.
And i do realise Nadal, even before 2012 has hardly played a full season. In his early years it was his Thiem like schedule. Same cause, same effect, got injured often. Then came something else, Nadal took way, way too long to learn how to properly move outside of clay, ie he spent way too much time sliding from side to side on HC or on grass and it's been bad for his knees, which led to most of his sidelines.
See:
https://www.youtube.com/watch?v=SzDx6gRYKnw
The last one is famous, but i like this version where you can see in slow motion how Nadal slides, while Federer actually makes little steps after his squash shot, when sliding would have been much easier.
I think Nadal decided to develop an extremely physical version of tennis. He isn't the same, Djokovic or Monfils to name a few do the same thing and guess what, they get injured too. Professional sport has had the same kind of transformation in pretty much every sport (football, rugby, basketball, whatever the sport i have the feeling injury count is way up from the 90's for instance), emphasis on physical abilities (especially goo in tennis for retrieval abilities) whih will lead to more injuries. I don't blame Nadal, but i won't weep on him either. He made his choices according to his best abilities and developed a style of play prone to injure himself.