It'd be cool if people could upload their (anonymized) medical histories to a central database so that they could gain additional insights to help guide their care.
If you included some genetic information like race or national origin, this could help people learn about the genetics behind the disorders.
I have a connective tissue disorder that presents as Marfan syndrome, but I went to a geneticist at UCSF back in the 10's. He looked at Marfan's, Loeys-Dietz, Lujan-Fryns, Ehlers-Danlos, and a bunch of other disorders that would explain any part of my physical symptoms, my cardiovascular problems, and my skeletal issues - he found nothing.