I don't understand the reason behind why China needs to match the number of LHD/Heli-carriers in regional rivals/competitors. If China consider those Heli-carriers as threats, why would you think that China could best deter these threats by building the same type of ships in matching numbers?
All of these navies: RAN, ROKN, JMSDF have their own particular mission for their Heli-carriers. Simply matching their numbers without allocating assets according to mission requirement is a waste of resource. In my opinion, if those Heli-carriers post a threat to China, they are best matched with long range anti-ship missiles, naval fighter-bombers, numerically overwhelming AIP submarines, naval attack drones, CATOBAR carriers, etc.