From the number of 022 being built, it looked like a large part of PLAN is still focusing in coastal and brown water defences rather than deep blue functions. No many how little crew members a 022 might need, huge number of them still tapped into the manpower resources of the PLAN.
And if the PLAN are a full blue water navy like the US and many European nations, they might not need so much of these small assault boats.
(slightly OT abit here). I am wondering if these 022 can be converted into large unmanned vehicles?