You might want to rewatch "Balance of Terror" or "The Lights of Zetar" which directly contradict what you're saying. You're mistakenly applying TNG-era Starfleet rules to a TOS movie. Oh wait, then there's Riker and Troi, who got married... Worf and Troi before that... Picard and Beverly... Oh wait, wait! Worf and Dax in DS9, Tom and B'Elanna in Voyager. You mean her unparalleled ability to identify sonic anomalies in subspace transmission tests? What a whore!