I really don't follow how a smaller ship would require a bigger launch and recovery mechanism for the same VDS as larger ships.
With smaller ships, where space is at a greater premium, you would want the most compact variants you can get for them, whereas it is typically the larger ships, with more space available, that tend to have the bigger and more elaborate versions of equipment, which usually also has greater range/functionality as well.
I wasn't thinking along the lines of a smaller ship needing a larger launch and recovery apparatus, but possibly being closer to the waterline.
Conversely, it might not only have to do with size, but also the geometry of the 056s aft. 052D and 054A have afts whose tops are fully flared outwards, whereas 056's aft flares out for the bottom half but then angles inwards again for the top half. That may result in a reduction of "minimum safe distance" from the aft hull (or something like that) for the VDS launch and recovery apparatus (given it seems to be located on the upper half of the aft hull), so the only way to solve this problem would be to either slightly extend the telescoping gantry crane or to reduce a few meters (or maybe centimeters in this case) of hull "length" by literally cutting out an opening from the aft portion where the VDS will be launched and recovered.
I don't think the bigger opening is indicative of larger or more complex geometry btw – I suspect that if it is the same VDS as 052D and 054A, that the equipment is the same. The only difference is the bigger opening. Once this 056 is more completed we can get a better sense of what that opening is for. If it has the same door geometry as 052D sans the bottom half opening, then it be confident it is for a VDS, but they may decide not to install a door, who knows.
There are definitely opportunities for UUVs in a variety of roles, and the idea of 056 deploying such technology for mine hunting is also interesting, but at present I think it is not the prime contender for 056s opening.
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I would like to see the next generation frigate leverage UUV and UAV technology, personally, along with having a greater emphasis on ASW. Have two modular davits for UUVs, two large Z-18 sized hangars that can accommodate Z-18s, Z-20s, or UAVs, and give them a top of the line ASW suite the same as 055s, with a modest 32 + 8 cell VLS and the rice lamp integrated mast we've seen, to provide medium end multirole capability.
On a blue water hull that is smaller than 055 and 052D, they will have a more affordable ship that can individually persist in dangerous waters to do mine clearing or ASW missions, or operate in a task group as well.
An LHA or LHD could act as a mother ship for UAVs and UUVs, but such vehicles have limited range and would place your mothership possibly near an enemy threat should you wish to launch and recover them. Makes more sense to disperse such assets among smaller, more survivable, and more low profile ships like frigates imo
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