[1] https://news.usni.org/2021/11/03/china-has-worlds-largest-na...
I am aware that there are still some unanswered questions regarding the role / effectiveness of aircraft carriers in a world of hypersonic anti ship missiles. But it's still some important context for that stat. These questions probably will not be answered unless a peer conflict occurs (which we can only hope never happens).
China needs carriers if it is going to fight the US over, say, Puerto Rico.
It doesn’t need them to fight the US over Taiwan. Mainland China (well, the parts close to Taiwan, at any rate) is one big, unsinkable, aircraft carrier for that war.
OTOH, they do need amphibious assault ships, but they have lots of them (slightly fewer than the US does.)
Try as I might, I can't escape the conclusion that it is totally valid for China to "dominate" a body of water called the South China Sea. In similar fashion, Thailand dominates the adjoining Gulf of Thailand. That isn't to say that neighbors like Vietnam or Indonesia don't also have interests, or indeed that shipping wouldn't be welcome under any flag, but simple straightforward reality is right there in the name. If there were some other entity called e.g. The Holy Righteous Ethical Sea Dominators, maybe they would have a case for dominating the South China Sea or any other part of the ocean. There is no such entity.