That's naive. Strategic and tactical bombing did jack shit besides kill or at least make life miserable for lots of civilians, and destroy lots of land for the foreseeable future in Vietnam.
Afghanistan is highly mountainous. Carpet bombing doesn't work very well for caves.
Commanders on the ground were asking for air-dropped landmines to cover the areas that Bin Laden could have been using as an escape in Tora Bora in December 2001. Air-dropped land-mines would have made navigating those mountains much more difficult for Bin Laden, and may have killed him on his escape.
They may use IADs, but we have far better equipment for that strategy. We can deploy our mines from airplanes and just blanket an area if we so choose. But of course: this strategy means killing innocent civilians who accidentally walk on the mines.
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Difficult Terrain works for both sides. Sure, its difficult for us to move in, but that also makes it difficult for the enemy to move around. Doubly so if landmines are secretly littering areas.
Afghanistan is highly mountainous. Carpet bombing doesn't work very well for caves.