How many $200 quadcopters delivering blow after blow to reach the equivalent damage to a single MOAB? Is it an impossible number to reach for those unable to deliver MOAB?
No reasonable amount of quadcopters could match a bunker-buster. Surface explosions are not very effective against buried targets.
The weight and density of the bunker-buster is extremely important to its operation. When dropped from a high altitude, it breaks into the bunker with sheer kinetic force, and then explodes once inside.
How long do I have to piss on a steel plate to get the same effect as a waterjet cutter?
About the same answer.