So....What is YOUR opinion on VIN swaps ?

Ok, this isn't solving anything. It's like--------------View attachment 1715024820
Your right. If the law gave a percentage of original metal to be required to be remaining we would then have an answer, but it doesnt. And that omission in the law means that up to 100% of the metal below the vin plate can be concidered for replacement.
Additionally a replacement body is only a part, and not a car.

This is why swapping a vin and identification to a new body is not concidered illegal, but swapping it to a used "car" is, because of the intent to defraud, or because of the possibility of theft or a lein on the altered vehicle. This is deception, and or outright fraud.