Please read the article ABC78 posted.
China's hardening stance in the SCS has little if anything to do with A2AD or AirSea Battle (or whatever its called now) and entirely to do with the real expansionist moves most of the other claimants, especially Vietnam has made in recent years.
Those nations are actually practicing the kind of "changing facts on the ground" and "salami slicing" acts Washington and the western media only ever accuse China of.
By remaining silent and wrongfully making accusations against China (in Beijing's eyes anyways), America has foolishly and needlessly angered China and destroyed pretty much all of its credibility in China's eyes about its ability to act as the independent mediator in disputes.
It is this utter loss of faith in the American led system that is the primary reason China started its land reclamation operations, and I can see China strengthening its determination to create its own rules and norms to replace the American ones in existence.
Ironically, in a weird sort of causational twist, China may well see A2AD as a means to resist what it seems as blatant American meddling and imperialism.
If you bend and break your own rules and claimed principles for petty gain and meaningless political point scoring, could you really blame others for not taking your rules and principles seriously?
If you bend and break your own rules and principles over an issue which you have zero direct interest, is it any wonder others will view your actions not as someone standing up for their principles as claimed, but rather those of someone going out of their way to look for excuses to mess with a certain other country?
I think history will judge this as a textbook example of how a leading power should NOT behave if it wants others to sign up to and invest in the norms and rules it has established, especially over such an inconsequential issue (from America's POV).
The lack of a coherent strategy and cogent long term game plan, other then maybe "screw the Chinese any which way we can" is truly breath taking.
You just exactly proved my point that a certain level of publicity and bum rap should be there to qualify for a historical waters claim. That's exactly one should expect. What else do you expect? Vietnam and Philippines will just hand over to you that 9 or 11 dash lines in a silver platter? US would roll over, play dead and walked away "Oh, all of SCS is ,yes, rightfully China's?"
Each party, including US, would get a bad publicity in the opposing camp/s. Several threads on this board covering SCS just prove it. What matters most is how do you manage it to get what you want without blowing the lid off . This endless bickering would go on until someone stops physically showing up around those waters. For that it would take resources , strategy - linking up several ongoing Chinese strategies to support each other's ends. But 50 years later, history would have abundant evidence that China does have a historical claims to these SCS waters, most of it, and nobody would say no they don't.