re: PLAN Type 052 Class Destroyer
it does seem as if they used up all of the real estate from 052c for the new VLS. And that is a lot - roughly 9 by 12 meters of deck space.
Since this is an AAW destroyer, long range SAM missiles are a given. And since 052c already had infrastructure for actively guided missiles, it seems ludicrous that 052d would install additional radars for semi active guidance.
Therefore i am guesstimating all the SAM missiles in those new VLS will be active guided. Question, however remains: Is the new VLS big enough (bigger than one on 054a) to hold hq9 missiles? Or are we going to see a new variant of hq16? (which would have to have considerably longer range and be actively guided. And at the same time it would mean PLAN gave up on hq16.)
HQ9 of course seems like a better bet, as it is already tested and is surely a good long ranged missile. But the downside is that it doesn't really offer much anti-missile defense, meaning the ship is left with only point defense anti missile systems.
Some new HQ16 variant would offer better anti-missile defense, another layer, not just for the ship which launched the missile but also area protection against incoming missiles, giving better protection to the whole fleet.
Would long range anti-aircraft protection suffer? That is hard to say. A more manouverable missile, but slower, with smaller warhead and smaller radar array.
Up until half a decade or so I would say it is good enough, as USN had just sm-2 variants which suffered from similar issues. But now that USN is pursuing sm-6, which is closer to Hq9 philosophy of intercepting targets - i am not so sure.
Ideally, the new destroyer should carry in that VLS both hq9 and hq16, but somehow that seems like the biggest leap of 'em all.