Focusing on ROC-A is a dual edge sword.
If it have to come down to the Army, then I see ROC-A and ROC-MC rapidly collapsing. Unit will ha hard pressed to trust one another, as some would defect/surrender. So you can spend more on the Army, but if it came down to that phase, all that gear will eventually wind up in the PLA inventory.
As for mines, torpedoes and ASCMs, I want to see what other opinion on some potential countermeasures.
Given that the Taiwan strait is shallow (100m) and relatively short. I can see PLA employing these following measures on top of EW suppression, deception and maybe even IFF disruption (
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Regarding the width of Taiwan strait, for the sake of operation it is really only around 50km, as PLA task force can probably linger just outside of the middle of the strait without providing ROC-N with any provocation for kinetic engagement. Given enough desensitization over multiple exercises, you can probably shrink the engagement range to around 30km.
So how do you preserve security in a area as long as 30km and as shallow as 100m?
1. Use PANAMAX container ship to shield critical task force assets. Devoid of cargo, 40ft container can act as applique armor blocks.
2. Use fishing trawler to "dredge" bottom clearing potential mine.
3. Trail commercial trawling flaps to act as a barrier for torpedoes, around capital ships.
4. Use China vast shipping and fishing and coast guard fleet to clutter the battlespace, potentially soaking up valuable munitions from capital ships.
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While I am familiar with naval and air systems, I'm a ground pounder at heart, so these speculations are likely pure fantasy.