Japan alone has 30 destroyers while China has only 50. Let's not forget that A2/AD applies against China too.
By "Japan alone has 30 destroyers" you mean 36 - And out of those 36x DDGs, only 8x of them are actual Arleigh Burke-counterparts (Kongo, Atago and Maya) as "fleet destroyers". The rest 28x are "escort destroyers" (Asagiri, Murusame, Takanami, Akizuki and Asahi), with only 16-32 VLS cells per ship. And out of those 28x DDGs, 8x of them (Asagiri) are old (they're built in the 1980s), to be retired soon and be replaced by Mogami FFGs.
In contrast, by "China has only 50 destroyers" you mean 52 - And out of those 52x DDGs, 8x of them are large DDGs (i.e. 055), 33x of them are general-purpose DDGs (052C and 052D/DG), and 11x of them being upgraded DDGs acting as "large FFGs/FFG-leaders" (052B, 051C, 051B, 052 and Sovremenny). And out of those 11x "large FFG/FFG-leaders", it is likely that 2 of them could be retired before the end of this decade.
Besides, need I mention that while the 28x "escort destroyers" are basically escorts for the main "fleet destroyers" and are specialized/focused in specific roles (Akizuki in AAW and Asahi in ASW, for instance) - The 052Cs and 052Ds/DGs are essentially general-purpose/multi-purpose, proper destroyers which can do pretty much every main role/task? Moreover, all of the 052Cs and 052D/DGs can conduct long-range/fleet-wide air-defense + long-range anti-ship strike roles - Can the JMSDF "escort destroyers" do the same?
And do I need to remind that the PLAN also operates 42x FFGs that are high-seas combat-capable (054A/AG and 054B) and specialized/focused in ASW? Now, how many FFGs do the JMSDF operate?
Moreover, all of these hasn't yet include all the other ships that are expected to enter PLAN service in the coming years (which @Tomboy has already explained above).
TL; DR - Numbers only tell a very small part of the whole story.
So shore based anti- ship missiles on 1st island chain will likely sink any PLA ship trying to get out.
And that's by assuming that, somehow, the rest of the PLA would just sit idly by and not send their special mission aircrafts, UAVs and satellites to scan, recon and scout along the entire length of the 1IC to pick out those AShM launchers.
Also, do you really believe that Beijing would just go "Today, let's go take Taiwan and/or the Ryukyus!" out of the blue, and all of the PLAN warships would just Rush-B from their home bases to try crossing the 1IC? Like, really?
In terms of navy China needs atleast 150 destroyers along with 10 carriers to make a dent against US and allies.
China lacks numbers
You're assuming that somehow, the PLAGF, PLAAF and PLARF would just sit idly by and do no jacksh1t - Which is wrong to begin with.
Also, the US Navy will never, ever, be able to send all 11 of their CVNs (and their respective CSGs) to the Pacific. So there's that.
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