One reason why edging is bad is because it makes the dopamine level high and that makes a person addicted. And most likely if a person is edging they will ejaculate and relapse. So in conclusion edging is bad because it makes dopamine levels high and can make a person ejaculate. Oh yeah and it can also make u a addict to edging which is worse because of the high dopamine. So yeah in my opnion that is why edging is bad.
It's prolonging the dopamine high to be more specific. My main problem through the years was edging to porn, and I would do it every day and sometimes go on edging binges, spending the majority of the day doing this. I seriously didn't want to O at all, and 95% of the time I didn't. Well, it finally caught up with me as I have PIED. I would say with absolute conviction that if all I did was PMO through the years, my condition wouldn't have been nearly as bad because I would've had much less exposure to the dopamine high. This link explains it well: http://www.yourbrainonporn.com/what-if-i-use-porn-without-orgasm