They don't need to be optimal, they just need to be better than others. I'm just not persuaded all the random things about cats are necessary and THAT's why th

They don't need to be optimal, they just need to be better than others. I'm just not persuaded all the random things about cats are necessary and THAT's why they are preserved. Is the catnip reaction necessary for example? If not - they aren't optimal, they are just good enough - like every other species.