I would venture that is is almost never required to remove the nipple. 15 cm is not that long. You have run up against a very old fashioned surgeon, or one that was poorly trained. Find a new surgeon.
I almost never perform a free nipple graft, and my inclination to perform a free nipple graft will go up when the distance from the fold to the nipple is greater than 20 cms. I have treated many large breasted women using a standard inferior pedicle.
Do I have to get nipples removed for breast reduction?
Thank you for your question. In my practice, I've never had to detach the nipple as part of a breast reduction. This includes many breast reductions performed with sizes much larger than yours. It's usually left as a last resort option if tissue viability is potentially compromised at the end of a case. Be sure to consult with several experienced board certified plastic surgeons. Good luck.
Nipple removal and grafting is only used in patients with an extremely long nipple to inframammary-mammary crease distance. In order to appropriately position the nipple, it must be removed and replaced as a graft. Nipple necrosis and sloughing is a risk in either type of procedure. Discuss your concerns with your surgeon so that you can have a better understanding of the procedure, the reasons which might necessitate it and the risks.
Photos are essential for a question like this. I will say that free nipple grafting today is extremely unusual but there is still a place for it. Even if it is done the complication you're describing can happen book is extremely unusual.