I personally find it more odd if the date wheel matches, I feel it's supposed to contrast so it's easily identified on the dial and has better legibility.
But no manufacturer ever (or hardly ever, sure there is one out there!) puts a black date wheel in a white or silver dial. If it were for contrast you would surely expect them to do that?
How often do you really need the date in such a hurry that you can't spare a fraction of a second to read it?
I personally find it more odd if the date wheel matches, I feel it's supposed to contrast so it's easily identified on the dial and has better legibility.