The delayed fuse bombs were not the default in WB. The default was a contact explosion, but the .dfuse 5 / 10 / 15 / 20 were available as well, so nothing would change for bomber pilots unless they were going to drop quite low and then they could use the delayed fuse option to prevent themselves from blowing themselves up while at low level. (I think that the .dfuse option had to set before taking off, that is, it couldn't be set when one is in flight.)
I didn't understand the comment about dropping a delayed fuse bomb in a hanger and then having it go off later. I must have missed something, because why would anyone drop a delayed fuse bomb in their own hanger? Now if a fighter dropped a defuse bomb while flying through an enemy hanger, that might work, dropping it on top or drop just before flying directly over a hanger would be the most likely scenario.
Those who would not like .dfuse bombs would be, IMO, GVers since a fighter could be drop and then be a distance away before it detonated. If the GV was moving it would, however, be a bit tricky to execute. Since GV icons do not show up until one is 1,000 feet away the .dfuse option could be a benefit for an attack aircraft. -kw