In that case, we are full of vestigial parts. Hair, teeth, pinky toes, pinky fingers...
What do we need noses for anymore? why not just have a hole in the middle of our face to breath through. And legs aren’t really all that useful anymore. We could get by with much shorter weaker legs and barely any feet at all.
Well, we are bound to have vestigial and semi vestigial parts if we are evolving. Perhaps the vestigial appendix had a good function no longer needed. But teeth are needed as is the pinky finger and perhaps the hair. ANd legs are useful. And the nose is necessary to filter the air a bit.
But the fact that the appendix has a function useful in small populations of people wide spread doesn’t obviate evolution as a theory.