I didn't realize the mere mention of an actress from a TV show from a bygone era could evoke such strong and negative reactions.
I just saw Lt Uhura as a character in a TV show, even when I was a Kid.
I didn't see her as Black or White, just Lt. Uhura.
That's probably what was enchanting about her, is that a person could appreciate her for who she was, not what she was or the color of her skin.
Anyways, what I seem to remember about her is that she was always placed in the background near the center of the camera.
So I suppose because she was so attractive and had tremendous presence, that's why she was always placed there so that she could be seen in the screen shots.