If you cut the hood off your jacket, do you have less jacket?

The inner part of your foreskin and glans are a mucous membrane, similar to the inside of your mouth or eyelids, when you remove the foreskin the glass is exposed, dries out, and keratinizes.

The skin of your penis is also supposed to be mobile and slide along the shaft, it’s sort of like a bearing, if a circumcision is done tightly it can’t do that and you may need lube for masturbation or sex that wouldn’t necessarily be needed otherwise.

The frenulum is often removed in circumcision and is one of the most sensitive parts of the penis, so removing that obviously loses some sensitivity

Definitely seems like it minimizes or destroys some normal functioning to me.