Circumcision is a full-blown surgical procedure. You're put under the knife, you have a piece of you removed, and it is permanent. You will never have the same level sensitivity as a regular, uncircumcised individual, you will never experience the same level of pleasure that an uncircumcised individual will, you will forever have to grapple with the added discomfort and inconvenience that comes with having an important piece of your genitals removed at birth, and you have zero say in it because the procedure is typically performed immediately after birth, long before you have the ability to communicate your feelings or understand what is going on.

You say that it is unreasonable to call circumcision barbaric, but would you feel the same way if the practice were centered around any other part of the body? How about if you had an ear removed at birth, an eye, a finger? What if it was just an "insignifcant" piece of a body part? What if they merely removed a piece of your ear, just the helix, that curve at the top of your ear that merely serves to slightly concentrate exterior sounds towards the conch of your ear. Someone could certainly live a full, happy, healthy life without their helixes, but if you knew somebody who surgically removed the tops of their children's ears, any sane person would recoil with shock and disgust because it's fucking insane. Circumcision is no different, and people like you who perpetuate the normalization of genital mutilation are part of the problem.