You miss the most important salient point.It wasn't limited to the Ho Chi Minh trail. They bombed bridges and tunnels everywhere scores Vietnam including South Vietnam.
Taiwan is much smaller than Vietnam. It is about 100 km across side to side. All of it's built up infrastructure is on the coast. Their back is to the mountains and oceans.
Amphibious forces have the key advantage of striking at a variety of places along the littoral while land based forces in built up areas are constrained by existing infrastructure and terrain. Replace that infrastructure with rubble and it stops wheeled vehicles dead in their tracks and tracked vehicles are significantly slowed.
Air supremacy alone doesn't guarantee supremacy on the ground because of cover, which Iraq didn't have. It guarantees supremacy if used to immobilize enemy formations which allows each individual enemy formation to be eliminated piecemeal.
in vietnam, in the air the US had air supremacy, but on the ground the US was always on the defensive, while vietminh and north vietnamese army was always on the offensive.
The US didn’t need the infrastructure it attacked because it had no plans to launch attacks on land around these that would benefit from these land based infrastructure.
It is essentially the same with US air interdiction over Yalu during the korean war,
so the US can freely attack the infrastructure because its enemy needs it, but the US has no prospect of needing it.
you may think having amphibious attack capability means you can attack anywhere. in reality the number of place where it is possible to land sizeable forces onto the beach is limited. The number of places where one could both land forces on to the beach, and the be able to readily break out of the beachhead and then reach someplace worthwhile is even more limited. I would not be surprised the number of locations where reasonable sized force can land successfully land and from their reach a operationally important objective in taiwan can be counted on the fingers or one hand,
Last edited: