With respect: crotch hair probably doesn’t seem to serve a purpose only because of clothing; interestingly clothing is both highly tied to Genesis and, if you believe Wyn Hoff, possibly not healthy?
Appendicitis is such a common childhood (pre reproduction) emergency that evolutionists struggle with how the organ could persist (modern surgery being a blip). Some think the organ persists as a deposit and repository for bacteria to reconstitute the microbiome (>90% of which is unculturable and cannot exist outside the human gut) in the event of a challenge. That’s a cool theory. I believe it.
The truth is probably something even more strange, even deeper, and something I could never guess