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And what visuals would that be? That existing races have no real sexual dimorphism's? Aside from actually sounding like a good reason to add a race with such differences, it actually makes sense given the basis for existing races. Only Miqo'te are the only other race it would really apply to (since everything else is basically just Human), but sexual dimorphism's in cats are very subtle outside coat colour, which Miqo'te unfortunately don't really have. Big cats would have offered something, but Miqo'te are more than certainly based off house cats and the Japanese Nekomata mythology. All Japanese cat girls are.
what's the difference between "human with cat ears" and "human with the sexual dimorphism of bees" your "rules" are fairly arbitrary. There is no mandate in art that one has to completely follow natural rules especially when one mixes and matches.