china can well call for it, the question is, does it matter? the UN has always had a bias towards the global north; once that there’s more countries from the south in there, the countries from the north will just stop listening to the organization altogether.

the reason why the UN was founded was mostly to do diplomacy to try and prevent the countries from the north of all destroying each other and thereby themselves. since the countries from the south weren’t so threatening to do the same thing, they were not included. it was never meant to actually represent all of the world, otherwise you would have to represent the deep sea too.