I asked how they look more functional and your answer is "because they look like they function". That doesn't tell me anything. The ships in Star Trek were designed by people with extraordinary attention to detail who provide rationale for every detail and create comprehensive blueprints, so you're making a fairly bold claim when you say a generic flying saucer with randomly placed bumps and grooves does a better job at "functional". Why should they say that and not "Team Edward One is King Apples", as per an old phonetic alphabet of the British navy? Like technology, military jargon changes over time and across cultures. Star Trek is about a "United Earth" where no one culture dominates and it takes place in the future. Using that language would unnecessarily tie it to one specific culture and time period.