Id also propose that the ships are built with up and down with the additional factor of navigation. Humans typically spend their entire lives in gravity so it’s probably easier for humans to navigate a massive ship when it is built like it’s in gravity so the crew onboard can focus on their jobs instead of figuring out what direction is the engine room. Additionally we always see that every ship in the show also has artificial gravity onboard. Making a amorphously designed ship even more confusing to navigate/traverse.
Id also propose that the ships are built with up and down with the additional factor of navigation. Humans typically spend their entire lives in gravity so it’s probably easier for humans to navigate a massive ship when it is built like it’s in gravity so the crew onboard can focus on their jobs instead of figuring out what direction is the engine room. Additionally we always see that every ship in the show also has artificial gravity onboard. Making a amorphously designed ship even more confusing to navigate/traverse.