Depending on how they are counted there are between 10000 and 70,000 different human diseases, and treatments only exist for around 500 of them. Further, the overwhelming majority of these treatments are not cures, i.e. treatments that end medical conditions in an individual.
Reminds me of GERD. It's a disease that affects a sizable group of people. It's a mechanical issue that is very well studied and known.
Yet, the main two treatment options are "workaround/hacks" or a very invasive operation.
There's only one [1] potential nobel "curing" treatment which is just gaining traction.
But innmy opinion with current technology, stuff like GERD or chronic bowel incontinence (due to mechanical failure of anjs sphincter) should be 100% solved.