Fair enough. But if that's the point...why? You'd just be making it harder to reproduce at that point

Yeah, but that' super rare. Only around 0.6% of boys experience it before they're 15. Even if you're born with true pathological phimosis, circumcision is usually a last resort because topical steroids are safer and have a pretty high success rate.

"The incidence of pathological phimosis is 0.4 per 1000 boys per year or 0.6% of boys are affected by their 15th birthday."

https://pmc.ncbi.nlm.nih.gov/articles/PMC3329654/

Please send a dick pic to verify allegiance

Because the foreskin isn't just a useless spare part. From an evolutionary perspective, it serves a purpose.

Think of it like buying a car and modifying the transmission. The car still performs it's primary function, but in a way that comes with trade-offs.

Circumcision is the same. Removing the foreskin (modifying the transmission) might improve some things like hygiene, but it will also completely remove the penis' natural barrier to protect itself from excess friction

For many, it makes them require lube in situations where they would otherwise need none.

For some, it makes things painful some or all the time.