Why is impractical to drop mini-nukes (FAB - 5000 (pic 1) and FAB - 9000 (pic 2), with UMPC)

Why is impractical to drop mini-nukes (FAB - 5000 (pic 1) and FAB - 9000 (pic 2), with UMPC)? Let’s start with the simplest one. FAB-5000, like FAB-9000, ultimately did not achieve the stated characteristics. Part of the explosive remained unused. No detonation. True, that can be solved through modernization. Yes, yes, there is evidence of good usage, when the geography of Afghanistan was changed and hills were turned into plains. Good for agricultural production and artificial lakes (also good for melioration). But, in the current conflict, given the saturation of air defense, they would be useless. Why? Dimensions. They are big. People who love explosions and terraforming would be thrilled, but there are a few problems. The bomb itself, plus the plane that will be required to launch the bomb, plus the low speed of gliding towards the target. A big, simply huge target for any air defense. To put it very simply - a bomb the size of an airplane. Carriers. FAB-9000 is generally ... Source: Slavyangrad