It’s a situation where there are benefits to either option but one probably outweighs the other massively in frequency. I schedule many more international meetings and make many more international calls than the number of times I’ve needed a global event time. And that’s kinda saying something since I’m a space geek that looks for astronomical events, which are all UTC. It’s fewer steps to look up the distant current time and do the math from my current time for a passive event than it is to have everyone be UTC, then look up a distant wake time or business hours, then do math to figure out what the functional time is for something requiring human input.
China is one universal time despite spanning from +5 to +9