Given the effort to appeal to casual viewers who might just click on to the channel the desire to avoid confusion is understandable, if misplaced.Apparently there were plans for the crew to switch uniforms but Berman said no because he wanted Voyager to be 'visually distinct' from DS9 so viewers wouldn't confuse the two. In other words, Berman thought trek viewers were so stupid they wouldn't be able to differentiate two very different trek series if both shows used the same uniforms.
But, let's not let it get in the way of assuming a mindset in the most negative way possible.

