The hairline advancement surgery is limited by the tightness of your scalp and usually an inch is the limit for most people; however, a hairline lowering hair transplant does not have that limitation (see here: https://newhair.com/female-hairline-lowering/). Also, note that the corners in many of these women were receded, and when this happens, a hairline advancement surgery can’t address this like a hair transplant lowering surgery.