How does a Trichophytic Closure on a strip scar work?

A trichophytic closure is performed n a wound typically in hair transplant surgery when a strip surgery is performed. The idea is to cut off the epidermis as shown in the schematic diagram below and then to bring the two edges of the surgical wound together with a suture or a staple. Point (A) is sutured to point (B) leaving the cut-off hair follicles below what will eventually become the wound and the scar as shown in the photo on the left. This is a patient where I performed a trichophytic closure at his strip many years ago. Please note that the scar did widen to a distance of 4mm (I measured it today as he came in for an FUE to thicken his hair and address is balding crown). This trichophytic closure technique removed a 4mm distance of epidermis so in this particular patient the entire 4mm section where the epidermis was removed was where the scar formed. Hair grew through the scar as seen here. Few surgeons who perform trichophytic closures remove 4mm of epidermis for reasons I don’t understand (they may remover 1mm from each edge of the wound which would not have cover this man’s scar).  What is interesting is that despite the hair that grew into the scar to emerge through the entire scar, the white scar tissue nevertheless appeared which is almost always the case. For this reason we do not fix existing scars with trichophytic incisions but rather with scalp micropigmentation which addresses the issues of scar color very nicely (see here: https://scalpmicropigmentation.com/scar-covering/).