Nice interview with ZYL by Butterfly:
Zhu Yuling's Comeback Interview: “I Just Want to Purely Enjoy Table Tennis Again”
EJs will find the comments re T05 Hard and Rozena most interesting.
Because all things being equal, it takes more effort to hit the new ball with the same speed as the old ball when using same rubber. Think about what is needed to activate the "catapult" of the softer rubber too.
Well, even FIFA is hopeless here.
See https://www.sportschau.de/usa-verweigern-kubas-volleyballerinnen-visa,kuba-usa-110.html and https://www.sportschau.de/einreise-in-die-usa-wird-ein-problem-fuer-sport,einreise-usa-wm-olympia-100.html.
Tried it once a couple of years ago on someone's zjk alc back when I played with K2 and didn't like it particularly. Not tacky, etc. IMO, Xiom c-series use a different technology for the top sheet, it seems at least a bit tacky.
Higher altitude -> more rarefied air-> faster/spinnier ball
Hotter/dryer air -> same
Humid/cold air -> slower/less spinny ball
Random air circulation -> unpredictable ball
Basic stuff.
Imo, halls with higher ceilings invariably tend to be large halls either with lots of people or non-trivial...
I've got to say that his idea that halls with higher ceilings result in "higher air pressure making it harder to play" is utter bollocks.
P.S.: Wouldn't surprise me if he said something completely different and it was mistranslated.