While the gravity-bomb problem can be dismissed as a WWII homage, there is some merit to it. Physical projectiles in SW have always had some sort of energy shielding around them, originating from a ship's projectile launcher. For example, when launched, proton torpedoes have red energy surrounding them. Relatedly, Star Trek's photon torpedoes also have red shielding. In both instances, I think its meant to signify to the audience that the shielding allows the non-laser based weapons to work in space.
As for bombs, in Empire, TIE bombers bomb asteroids looking for the Falcon. The bombs they drop have a blue energy field surrounding them. This probably means that they were not dropped, but rather launched downwards the same way a proton torpedo would be launched.
The creators of Empire probably recognized the physics problem of dropping bombs in gravityless space, but wanted to keep the WWII-aesthetic. As a solution, they made those blue energized "space bombs". Audiences were meant to recognize the WWII aesthetic, but also accept the weapon's feasibility, because its blue energy signals that its a different technology.
As for bombs, in Empire, TIE bombers bomb asteroids looking for the Falcon. The bombs they drop have a blue energy field surrounding them. This probably means that they were not dropped, but rather launched downwards the same way a proton torpedo would be launched.
The creators of Empire probably recognized the physics problem of dropping bombs in gravityless space, but wanted to keep the WWII-aesthetic. As a solution, they made those blue energized "space bombs". Audiences were meant to recognize the WWII aesthetic, but also accept the weapon's feasibility, because its blue energy signals that its a different technology.