What would be the role differentiation between 052D and 054B then? Would 054B simply be a slightly discounted version of the 052D? I think that isn't likely. I think much more likely any follow up 054A would use the same anti-air system as the 054A, but feature improve ASW capability, which I continue to regard as the weakest link in Chinese capability.
The whole point in investing in an universal VLS is to put it on all ships that can take it to streamline logistics. To argue that the PLAN won't need the 054B because it uses the same missiles as the 052D makes no sense whatsoever and is like suggesting the USN don't need Burkes because they have the same VLS as the Ticos.
Every fighting force needs a good mix between quality and quantity, a hi-lo mix as you will. Sure it would be cool to have a fleet comprised entirely of 052Ds and heavier ships, but not everyone can sustain USN levels of spending, hell, not even the US can support USN levels of spending, and Uncle Sam is making deep and painful cuts to its current and future force structch as a result, but that's off topic.
The point is 054B might have the same VLS and even carry the same missiles as 052Ds, but the 052Ds will still have the far bigger and better sensors, and likely more/better signal processing and fleet C&C capabilities on top of the bigger weapons load. However, the 054B will be significantly cheaper to build and operate, so the PLAN can field a far bigger fleet with 054Bs and 052Ds than it can with only 052Ds.
If the fleet has a streamlined VLS and weapons load and have the right datalink and software, a few 052Ds could use their superior sensor range to provide co-operative engagement targeting support for several 054Bs scores of miles apart, so there shouldn't be much if any performance compromise compared to if the fleet comprised entirely of a smaller number 052Ds, and indeed is likely to prove superior to the 052D only force in most scenarios.
With the new universal VLS, an 054B would still be able to carry HQ16s just like 054As, but would also have the option for a far more diverse weapons load, ranging from HQ9s to the future PL12 quad pad packable SAMs to cruise missiles and AShMs, potentially allowing the designers to go the same route as the 052D and loose the box AShM launchers to get about few more 8 cell VLS modules in the back for a much bigger weapons load potential.