I completely agree and experienced it myself (missing what you don't have). I just meant in the terms of a bunch of replies that I've gotten in here to the tune of "I'm a cis guy who was circumcised at birth and it doesn't bother me at all."

There's the possibility of something akin to how some trans people experience permanent low-grade dysphoria and it affects their frame of reference. Basically, if we were to map the feelings of dysphoria out on a scale from 0 to 10, the average person would be at a 0 under normal circumstances, but some people are born at a 2 or a 3. So to them, a 5 would be the average person's 3, and experiencing a 0 would be like getting glasses for the first time and realizing that trees have individual leaves and this is how everybody else sees the world. If you can only reach a 6 on a scale of how enjoyable an experience is while the average person can hit a 10, how would you have the frame of reference to know that you are or aren't missing something when you've never felt a 7 or above? So these people saying that they weren't negatively affected could just be mistaking a 6 for a 10 and there's no way for us or them to know for certain.