I have a pretty good idea.
Allow me to point out to you that a “modern” navy was not required at Dunkirk.
Dunkirk was an EVACUATION, not an invasion. Two totally different things. One thing to frantically try to escape somewhere without all of your equipment and supplies (which were left at Dunkirk), another completely different thing to make an opposed invasion.
And the majority of the troops evacuated at Dunkirk were evacuated by the Royal Navy, despite the involvement of small British civilian craft to pick up some of the troops.
Thousands of little craft carrying platoons across 110 miles is certainly very doable and actually very difficult to defend against if you do not control the air.
And armor, heavy artillery, and the obscene amount of supplies needed for modern combat are carried in these little craft?
Opposed amphibious invasions are the most complex thing in warfare. Such an invasion of Taiwan would be more difficult and complex than either the invasion of Okinawa or Normandy in World War II. And the PRC has ZERO experience in conducting one.
Remember, Victor/Liberty ships in WWII were being completed in 60 days.
And were essentially unarmed.
Also keep in mind we're so used to fighting fanatical/suicidal enemies now, and the odd example of the Japanese in World War II, that we can forget that not everyone is the same. While the initial Chinese forces in the Korean War were pretty ideologically motivated and fanatical, we killed all those guys, and otherwise in Chinese history there's no particular pattern of suicidal/fighting to the death military forces.
There were more than 30 shipbuilding companies during WWII pumping out ships.
We now have only 2 large shipbuilders in the country. 3 if you count GD making subs.
We could never duplicate what we did in the BIG ONE because infrastructure is not there any longer.
Do we even know what the ChiCom’s capacity for shipbuilding is?
A false straw man argument.
Your first mistake is making the assumption that you NEED all of those supplies to sustain a military operation. In truth, you only need rations (including water), ammunitions, fuel and means of communications to conduct a combat operation. Anything else is extra and not required. To assume it does is to make the classic large Army mistake in that you assume the other guy simply must do things the same way that you do.
Allow me to provide an example from your prior message. Your comment about the liberty ships... true, they were unarmed. How difficult would be to retro fit a existing cargo ship ... say an ocean barge, with a battery of MRLS and a supply of rockets? Or change that, how about turning one into a low cost helicopter refueling station. land on the deck... get the fuel and then fly off to the next ship to load up on troops or ammunition or rockets?
Also, you mentioned the Chinese forces as having no experience in conducting such an assault. But in this scenario, they would have the experience of one major assault.
Consider the damage that would be done on the Taiwanese forces during the first assault. Much of their military would be reduced or nonexistent. The population of 25 million would likely be severally reduced.
Never underestimate the enemy. Heck, just buying the WWII surplus ships refit for operations and then conduct a naval blockade of Taiwan would be a very effective means of reducing the Taiwanese ability to respond to such an attack.
And who says it has to be a naval / marine assault. 10,000 helicopters and a couple thousand sea planes and a thousand bombers and a few hundred attack fighters could overwhelm the remaining Taiwanese forces.