If I may make a rough analogy:
056 = J-8
054A/X = J-10
052C/D/X = Flankers
055 = J-20
If the PLAN can afford it I am sure they would love to have a large core force of 054A/X and 052C/D/X but the recent surprise troop reduction shows the PLA overall has a tighter belt than their annual percentage budget increases would suggest.
I'm not sure about that -- it all depends on where that troop reduction is done. I imagine the Army and a lot of the bureaucracy and administration behind the Chinese military will suffer the vast majority of the troop reduction. The nature of China's military missions has already dramatically shifted from a land war to a naval-air war, and lots of inefficiencies have been exposed in recent years, so this troop reduction has long been expected.
If anything I expect the Navy and Air Force to experience boosts in absolute personnel numbers relative to previous years, even though the Chinese military overall will experience a reduction.
Specifically the PLAN's development may have been spread thin pursuing niche projects across the board from hovercraft to carriers. With the choice not to modify the latest 071 build I think is a sign the PLAN may be re-prioritizing to focus on building their core generalist surface combatant force: corvettes, frigates, and destroyers.
I'm not sure if the Chinese Navy development has been "spread thin" -- but I do think they are definitely realizing that some capabilities are probably not as important as others.
I wouldn't also try to extrapolate too much from the latest 071, the fact that it doesn't feature any meaningful external upgrades could be because they are intending to field upgrades on the next batch of 071s if they are produced, or maybe that they don't view a need to upgrade their LPD design... it's still early days yet.
The 056 is a cheap stepping stone but as with the J-8 it is likely a stopgap barely meeting the PLAN's needs while new systems with significant improvements in capability are fast coming online. It also only serves a "sentry" role effective only within the first island chain. Due to these limitations I think the PLAN would rather build more 054A/X or 052C/D/X instead of more 056 but I think 54x in the class makes sense:
NSF - 12x
ESF - 12x
ECS - 6x
SSF - 12x
SCS - 12x
I wouldn't call the 056 class a "stepping stone" and comparing it to the J-8 in the Chinese Air Force isn't also something I really agree with.
I think we need to view the Chinese Navy in future as really made up of "two fleets". One fleet is the "home fleet"/HF and the other is the "expeditionary fleet"/EF. These fleets would not exist in any administrative form, but rather it will be based on the numbers and types of ship which typically occupy any particular region of water.
The HF includes a variety of shorter range surface combatants and FACs including 056s and 022 FACs, but also includes a large number of blue water capable ships including destroyers, frigates, and future carriers etc (possibly amphibious assault ships depending on how many there are), and these ships would likely remain in the western pacific and possibly the first island chain.
The EF would include only blue water capable ships such as destroyers, frigates and carriers, amphibious assault ships, and would be made up of any ships which are operating outside of the western pacific elsewhere around the world.
Therefore, I see the role of the HF and the EF to be fundamentally different.
I see the HF has the job of conducting high intensity warfare around China's peripheries in the western pacific against a number of high capability potential adversaries, and for such a mission, I believe 056 corvettes and 022 FACs still have a role in the order of battle even alongside frigates, destroyers and carriers.
On the other hand, the EF has the job of conducting lower intensity warfare and patrols in blue water against a number of lower technology adversaries against low capability opponents, but still requires the capability to defend itself and survive against a limited attack from a higher technology opponent, and for such a role, of course only blue water capable vessels and power projection vessels would be suitable (AKA no FACs, no corvettes).
Therefore, I do not believe the 056 class is a "stepping stone," because the nature of China's geography and maritime surroundings (and regional geopolitics) means that for the long term forseeable future, it will always likely need a relatively large fleet of lower endurance, lower capability surface combatants to patrol its closer waters and littorals even while larger blue water capable surface combatants conduct action in the open ocean of the western pacific.
I believe that even if the Chinese Navy ends up building 24 052Ds, 24 055s, and 24 next generation frigates within the next decade or two, they will still have a role for corvettes and possibly even 022 FACs.