Concerns about breast fat grafting

I unintentionally lost a lot of weight, and my breast size has decreased significantly. Since I wasn't very large to begin with, the weight loss made it very noticeable. Even though my weight is recovering, my breast size remains the same. Does breast fat tissue not fully recover once it is lost? If the surgery is safe and has minimal side effects, I am considering breast fat grafting, but reading reviews about sensory abnormalities, immune system decline, skin conditions, and arm sensation issues makes me very scared and hesitant. A friend of mine had surgery a few years ago and has been doing well without any side effects so far. Is the occurrence of such side effects due to choosing the wrong hospital, or is it just individual variation? I am curious whether breast fat grafting surgery is suitable for everyone or if some people simply do not respond well. Also, should I avoid hospitals that offer discounted prices through events or promotions?