The number of times Fan Zhendong served long at World Cup 2018: 0.
Nope, still the good old stubborn Fan Zhendong.
Its a problem of the shoes, not the flooring.
Use the most ordinary textile chnese sneakers and you'll never slip and scratch.
I don't think so. Look at the games there, in almost every game you have people slipping and even falling sometimes.
There was definitely something off with their flooring. I've never seen anything like that in tournaments before outside of like, a local school-gym tournament.