I believe that this discussion (and the very question by
@B.I.B. which initiated it) revolves around the core issue that China is facing WRT hypothetical but highly probable full-scale conflict in the WestPac region -
Strategic depth.
Unlike the US located at the other side of the Pacific - Unfortunately, geography is not working in China's favor.
Until all of the following three prerequisites are met, China will never have a true geographically-based strategic depth of her own, and China will always have her population centers exposed bare to threats coming from the east and southeast:
1.
Taiwan finally reunified,
2.
Ryukyu fully liberated, and
3.
Japan, South Korea & the Philippines completely neutralized.
In order to address this, China will have to
establish her strategic depth of her own -
artificially.
China's artificial strategic depth has to encompass not just the
entirety of the FIC Belt, but also
large portions of the SIC Belt too.
In the sky, on the surface and
underwater - China's artificial strategic depth will need to be able to cover all three of these domain too.
For this to happen, the PLAN, PLAAF and PLARF require huge expansions and upgrades. However, as the WestPac is practically vast span of empty ocean with islands dotting the landscape, the PLAN & PLANAF will be the decisive player, while simultaneously in close coordination, cooperation and management with the PLAAF and PLARF.