This is, I think, different from external procedures, such as "Brazilians" where the aim is apparently to "improve" appearance. My understanding is that it is to address internal damage/irregularities that may have arisen through during childbirth and which affect sexual function.
Whatever the reason for women undergoing this procedure, if reputable experts are saying it can, and does, cause further serious damage, then it should be avoided.
From what I've just read, this procedure is different from the mesh procedure used, I believe, to treat prolapse of the womb, which has apparently caused great pain and distress to some women who have had this treatment.