The fourth point is by far the most important, in my opinion. I think that Chinese Aircraft Carriers ought convert to catapults, as this allows greater design flexibility and more surface area. Plus AWACS, EWAs & Cargos are equally important to the aircraft carrier, as the combat aircraft on it.
AFAIK only the US builds aircraft catapults capable of launching todays naval aircraft. I dont think its a easy task developing catapults, but i could be wrong.