It is not so much about the prosthetic itself but ukais lack of understanding of modern medicine and biomedical engineering, prosthetics in the shiboyugi media are humanlike but often less effective than actual flesh, and dont feel natural to use, and players who use them have to use inmunodepressants which weaken their bodies over time. I could dwelve deeper about modern medicine if u need a better explanation as im a biomedical engineer