Going way back to the original post, RCA was the parent company of NBC, so they issued edicts to the network, to relay to the producers of shows, to make their shows as eye-poppingly color as they could.
So yes, when you were at a neighbor's house with a color TV and STAR TREK, or any NBC color show came on, you were supposed to be wowed by the colors.
And I think the STAR TREK design crew did a fabulous job in that department. Not only with the primary-color-type uniforms, but with those splashes of colored light that painted the corridors and backdrops of the series.
Yes, it's totally unrealistic, but I sure do love looking at it!