This is pretty disingenuous.
I play table tennis and badminton to a high level [#80 in my country in TT, and my badminton level is around 75% of my TT but i don’t compete] and have transferred these skills to tennis as well since the main 3 important skills for each – footwork, handeye and stroke technique are pretty similar / easy to work out.
Badminton has an extreme curve in terms of deceleration. The 420km/h smashes slow down considerably.
At a strong/decent amateur level/pro level, its not ‘seeing’ the ball thats an issue. Its having your body and feet in place to be able to play a quality return, and then recover from that stroke.
Speed of the ball, esp. when it decelerates so much in say badminton [not to mention that its ‘easier’ to play a return, you don’t need to time it perfectly, you either need to keep it short or long] is the same reason why most players are better at blocking smashes than actually smashing in badminton.
In tennis, the heaviness on the ball means you can’t just laser the lightweight shuttle back where you want it, and only have to consider the momentum of the ball / your stroke, you have to account for more things.
I love badminton, but the intensity of the sport comes about not from the speed of the smash – certainly not calling it 400km/h. It comes from incessant positioning and dynamicism.
Same thing in table tennis. I’m a fat ‘amateur,’ yet at the end of a long tournament, in just a 9 second point, I had to reposition my feet 40 times. The rapid transfer of body weight in all of these sports, as you get to a decent level, is an absolute killer to your legs. Its the same in badminton – i can’t comment on tennis because I don’t play it to a good level.
But the difference between a 1 in 100 player and 1 in 1000 player is the intensity they can play at in all the sports. Mistakes start creeping in as the points get more and more dynamic. Not even necessarily the ball/shuttle going faster. Just slightly better placement, slightly deeper shots, slightly less predictable play. Every factor of 10 makes it that much more difficult.
Its also like a gas tank for a car. The more gas you have, in a race, the more you can afford to expend in each lap. The more intensity you can bring to each lap.
There’s an 85 kg 5’5 Chinese 50+ obese dude at my table tennis club. His legs are literally basically bigger and more toned than 3/4 of the mens legs when you search ‘strong muscular calves / legs.’
His upper body represents mine kinda [obese torso], his lower body is basically an olympic athlete.