I disagree. One of the major themes of the Russo-Ukranian war has been the extreme survivability of air defenses. Russia has been unable to suppress a few dozen S-300 batteries. 50%+ Kalibr shoot-down rates are likely real considering that the Ukrainian electricity grid survived (At low capacity but it wasn't big and Russia had a big arsenal).
I agree with the second assertion. IMO naval subsonic missiles, especially ones from surface ships, are the most impotent way of attacking a country. You are limited to a few dozen non-replenishable missiles. The assets are limited to ~20 knots over large distances so looong times pass before they can launch a few more dozen missiles again. Carriers can at least carry a lot more munitions and subs can go to dangerous places. Subsonic and non-stealthy missiles mean at least half of them will get shot down, which throws a wrench into planning. The 055 could at least use the YJ-21 to have a bite. China is lucky that the US procurement went so bad that the country is unable to move away from 40 year old designs.
Problem is the platform is pricy. 055 needs to be protected. The swarm tactics dont translate into naval in this sense.Another lesson Ukraine war has taught us is that cheap subsonic cruise missiles/decoys with high RCS (not the million dollar Tomahawks or CJ-10) could be launched en masses (ideally in the hundreds) to deplete enemy air defense munitions. This could done via affordable loitering munitions to attract enemy air defenses or simply decoys with cheap turbojet engines. Once the enemy’s SAM sites run out of munitions or need hours to reload, then you launch the more expansive weapons line CJ-10, Tomahawks, Kh-101s, DF-21s, etc. to take out high-value targets and infrastructures. An idea weapon in this case would be hundreds of cheap loitering cruise missiles with some ARM capabilities (ideally focusing on S, X, C, L, K, and other commonly used military bandwidths) , so if they don’t get shoot down, they do strait toward SAM sites and airport radars.
This should be done by cheaper more disposable specialist vehicles.