So PLAN are not building 20 more 054A.
Never understood that rumor. It seemed illogical that PLAN would build so many 054A and be stuck with so many inferior vessels down the line. Meanwhile they knew what other navies were building for their FFGs.
Whoa, let's hold our horses a bit.
At best, we don't know if the 20 054As are going to be built or not.
But it's far from certain that they're not.
In fact, if I was forced to guess one way or another, I would argue that 20 054As is likely to be built.
First, let's remember that building 20 054As does not take very long at all. Even if HP and HD each use only a fraction of their current total frigate building lines, they can launch 20 054As in the span of 4-5 years.
What we know about 054B also suggests it will indeed have some significant improvements from 054A and perhaps even the entire PLAN's roster of naval ships, specifically in terms of its propulsion (if it is indeed IEPS), and that sort of advancement isn't something where I see the PLAN being comfortable to commit to without having an extra stopgap in service if there are teething issues.
Lastly, the construction of 20 054As does not mean that 054Bs cannot simultaneously be built for the navy, nor does it mean 054Bs cannot also be built at the same shipyards (HP and HD).
After all, it's not the first time that a Chinese shipyard has built two different naval ships of the same "type" for the PLAN, at the same time.
I am of course talking about 055 and 052D, both technically being "destroyers".
Now, while I certainly don't expect 054B to be that much larger than 054A in the way that 055 is that much larger than 052D, I wouldn't be surprised if 054B much more capable than 054A in the same way that 055 is much more capable than 052D (mostly by virtue of the fact that I 054B's sensor suite, weapons suite, CMS and weapons are likely to be significantly more capable than 054As was, whereas the difference between 055 and 052D is "relatively" less substantial).
I also wouldn't say that 20 054As means the PLAN would be "stuck" with inferior vessels.
054As are not meant to be the equivalent of Type 26 family, Constellation class, Gorshkov, or FREMM -- that will instead likely instead be the role of the 054B.
Instead, the 054As will be a cheap, mostly green water (but blue water capable if needed) ASW and patrol frigate with multirole capabilities and an AAW capability that is able to individually defend against threats from non-peer military threats, or to contribute to the defense of a task group against peer threats.
All in a ship that is cheap, proven, with a large production run meaning that any MLUs that are developed for the 054A class, will be able to benefit most if not all of the ships of the class.