Because the A20, B25, and other USAAF bombers were employed as low level bombers historically. Scraping the treetops on your attack run was one tactic used by the 345th in the Pacific. That and parafrags and daisy cutters were used to devastate Japanese airfields.
With the current setup, there's no way to duplicate this. Adding time delay fuses to all bombs would be both useful and realistic.
The Jug pilot who I interviewed ( and am STILL compiling information from) told me about one raid in particular, in which the Germans were holding all the women and children from a French village hostage to try and delay the Allied advance. He and 3 other Jug drivers devised a plan to hit the enemy command post situated in the middle of town in the "courthouse". They came in low, no more than 50 feet off the deck, and hit the building with 500lb eggs, each having an 8 second fuse. This allowed them time to hit the structure and still egress the area before the blast. The plan worked, the building was destroyed, and they all escaped unharmed.
I'd like to see delay fuses added sometime in the near future, but whether or not we get them is up to HTC.
