I am really curious (and mortified) how these kinds of colon sigmoid vaginoplasties are going to age in transgender men. Did a quick scopus search and, like peritoneal, this seems to have originated in gynecological oncology and to fix birth defects in women. Somewhere back in this thread there was a paper about how this colon tissue underwent neoplasia due to lack of nutrients and constant inflammation. Getting this operation at such a young age, and then living like thirty years with it (optimistically), you wonder what kind of ailments they will suffer from in their older years.
Same for peritoneal, this is such a novel method and people like Jazz Jennings get them in their 20s or even younger, without even knowing what exactly will happen to them in their future, or how to treat these conditions then.