I have specifically addressed this with 3 Thai surgeons, an Australian and a USA surgeon. So here is the simple answer.
You do not need to do electroysis or laser in the scrotum and penile shaft. It would be helpful to reduce the amount of work during surgery as this is a careful and slow process. Generally, the surgeons in Thailand have and assistant that does the prep work, which includes the scraping of the hair follicles, the Australian surgeon stated that electrolysis would reduce the time under anesthesia as they would have to do the scraping, and the USA surgeon had the same answer as the Thai's.
I suggest that you bluntly challenge these doctors that require electrolysis. Its barbaric and out of date.