Kiss aside, there’s no question Nichols was underused in the series . . . Uhura rarely joins a landing party. But even when she’s not the focus of a scene, she is regularly onscreen, even if just visible at her post on the bridge, completing the picture, contributing to the emotional tenor. (And when she isn’t there, you notice it.) As the communications officer, everything runs through Uhura: She’s the voice of what’s happening elsewhere on the ship, and what’s happening outside the ship, whether announcing the presence of some other spacecraft or relating what’s up with Planet X. Even reciting lines like “I’m receiving Class Two signals from the Romulan vessel” or “Revised estimate on cloud visual contact 3.7 minutes,” she is the picture of the professional. She builds exposition, asks important questions; wordlessly reacting to some bit of business on the viewing screen, she brings an emotion and energy into the scene different from that of her sometimes blustery male colleagues.
Source: What made Nichelle Nichols essential to ‘Star Trek’ as Uhura – Los Angeles Times
Retreading for Retirement 