IIRC the reason PLAN developed Type 730 and then Type 1130 is because they deem the dispersion of H/PJ-13 as too much, hence lowering the hit probability. Type 1130 was developed because ~10000 rounds/min was what their research finally determine is needed to have a sufficient chance of shooting down modern AShM. The drum vs deck penetration ammunition supply choice seems to come from PLAN preference to be able to choose where they want to put the CIWS. Having deck penetration means you're limited on where you can put your CIWS, and PLAN seems to prefer not having to deal with that headache.
the high angle elevation capability is pretty nice, but I do think having a radar integrated is better as that means the radar doesn't need to pick and choose which target to illuminate, especially in a saturation attack. It probably also shortens the reaction time as there's not much processing loop to go through.
p.s. I found
well, yes, but I presume it isn't as painless as putting a Phalanx or SeaRAM. Having a drop-in CIWS like Phalanx seems to be a good idea, especially for ships that are pressed into service/ current ships that operate in really high threat environments.
for the CIWS part, I do agree with you. However, if you're just fighting fast boats, why not put H/PJ-17 in the blind spot? that's even cheaper and it's sufficient for the job.
730 and 1130 probably has a better way of absorbing the shock and vibration. While 1130 has 10,000 rounds a minute two AK630 can achieve that, and you have to figure the weight of a 1130 turret vs. two H/PJ-13. The gatling gun on the AK630 is still used with the Kashtan and Palma CIWS.
Type 730 and 1130 isn't search independent like Phalanx or Goalkeeper because the radar on it is a tracking radar. In the case of the 730 and 1130, you need the Type 364 to search for targets and assign them to the CIWS. The Type 347G on top of the CIWS (right hand corner of the image) --- same as the one minding the main guns on the 054A and 056 series, mind you --- tracks and locks at the target. There is no search radar on the CIWS, and the only other thing attached to it is an EO/IR.
This isn't like the Phalanx where the R2D2 housing contains both a search radar (1) and a tracking radar (2). Note the drum (4) and the underlying parts (6 & 7).
While the Goalkeeper CIWS has been cited for its physical similarity with the Type 730, it differs in one important aspect and its black sausage thing on the right hand corner of the picture: a search radar. The round disc next to it, which is similar to the 730's Type 347G, is a monopulse tracking fire control radar.
The reason for this is that many ships doesn't have something like the anti-clutter Type 364 radar that covers all the quadrants of the ship from a height, including the rear arc. The radar specializes in searching for antiship missiles flying low in a sea skimming phase.
Here you see it on top of the first funnel of the ship, while there is another radar on the back and a Type 349 covering the front.
But if you take this AOE, there is no radar with a similar purpose.
The search radar on the Phalanx helps with all the blind spots and searches for antiship missiles. That's also the reason for SeaRAM which is namely the Phalanx R2D2 with these component radars, mated with an 8 launcher RIM-116. Its also why the PLAN never bother with its own equivalent because of the reasons above makes making one moot.
Now go back to the cutaway of the Phalanx, what makes you think its a drop in? Its not. There is a lot of stuff underneath it. The whole turret is about over 6000kg, and that's also in line with the Goalkeeper (6300kg) so I would expect that with the Type 730 and the 1130 would even be heavier. The AK630 weighs about 2,000kg with ammo.