I'm in agreement with Crobato here.
The SM-2 may only have 1/4th the warhead of Harpoons, but the speed & kinetic energy will punch through most ship hulls. We're talking about something that's moving at Mach 3+ here. Modern warships aren't built like WW2 battleships, there's no heavy armor plating.
Commenting on earlier posts in the thread... The earlier PLAN destroyers could mount 16 SSM's, partly because other system requirements were lower or nonexistent. i.e. stealthy hull, VL-SAM, aviation (helicopter + hanger), etc.
Today the chance of ship-to-ship engagement is pretty low. If we look at all the ships sunk during Falklands War, the vast majority were attacked from the air, with only 1 submarine scored kill.
A "near future" PLAN DDG design would have to incorporate multi-layered defense against enemy AShM's. The VL-SAM & sensor system will be far more costly than the SSM's.
Just off top of my head, I'd like to see the development of 2 new types. The first is multi-role DDG, I think something like the S. Korean Navy's KDX-II or KDX-III would be a good model. The second would be an ASW DDH, something like the Koran LPX or Japanese 16DDH helicopter flat-tops.
The DDG's primary role would be guided-missile destroyer, or in effect an AAW destroyer. It'd be responsible for medium and long-range fleet air defense. Perhaps with naval version of S-400, and maybe later with S-500 upgrades for ballistic missile defense?
The DDH's primary role is to be a light helicopter carrier for fleet ASW helicopters, and later UAV's. It only needs to be equipped with point defense and CIWS systems. Perhaps a smaller version of the Type 071 built as a flat top, or at least in a configuration that would maximize its aviation assets. This ship would be very useful for a variety of missions.