I don't know. As I said, I'm not too deep into Star Wars lore, so this may just have been a knee-jerk reaction on my part when seeing those bombers and the bombs falling “down” in space. It just looks stupid to me as a concept, that's all. It didn't break the movie for me.
Funnily enough, the kind of mental gymnastics you are employing to justify how those bombers actually could work within the Star Wars universe are the same thing people have been using forever to rationalize oddities and mistakes in Star Trek, like where this shuttle emerged from the Cerritos for example. They are different animals, of course, and I think it's a little unfair to compare a movie series with years long production times with a television/streaming show and reasonably expect the same level of attention to detail.