Oh, now I remember, there is one episode of TatG where they mention that tE tries to be realistic when it can, but silence in space?
I believe they'll say rocket engines firing is a storytelling device and an emotional component of a scene and you can't move a ship in silence, it kills the scene. TV craft before realism, sorry.
If someone knows which episode that is, I'd love to hear Franck and Chatham discuss that.