Why can't the 056s replace the earlier and smaller Jianghus? Displacement wise, they are not that far apart. Keep in mind with modern weapons systems, miniaturization has helped offset some of the displacement. Automation has reduced the need for crew and the space needed for them so that further negates displacement. When the 054s were developed, they grew in capability and endurance but that left a glaring hole in the lineup, there is still a need for a basic littoral vessel once the Jianghus get phased out. Weapons complement, they look like they have a similar roster, again 056 having modern versions of each weapon's system.
Your logic does make sense in some ways. But, that's not how 056s are going to be used by PLAN. The future (and current) PLAN structure will be totally different from the past. 054As do not replace 051s. Yes, even though 056 is about half the size of Jianghu, it is more advanced in every way. However, it has a different roll to play in modern PLAN. And in the sea size does matter. You can check out the picture of 056 and 054A together and picture of 054A and Jianghu together to see how small 056 really is. The fact that the first few 056s will be placed in Hongkong says it all.
From western point of view, Jianghus are 'basic littoral vessel'. But for PLAN they were 'modern' frigates which they could barely afford at that time. The glaring hole in the lineup so many military fans talk about isn't really there from PLAN's point of view. That hole you are talking about is kind of ship like 037 which PLAN is still using. Yes, 037s are too far away in the line up from 054As. That's because 054As are the latest for PLAN in that cagetory. And 037s have not been placed, yet. Well, if you can wait another couple of months, 056s will soon replace 037s. Then, there won't be any 'holes' left...
As I said I do see the reason why people think 054As could replace 051s. And 056s could also replace Jianghus. For instance, if PN buys 056s, their 056s would have the same roll as PLAN's Jianghus in the past.
So, if you are talking about spec sheets (or other smaller developing countries), then 056s could be the replacement for all those Jianghus. But, if we are talking about PLAN, 056s are not the replacement for Jianghus.
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