Mainstream medicine is 99% antibiotics/vaccinations/antifungals. Without antibiotics, we can't perform surgery, or implement artificial organs. If it's not a vacterial/fungal infection, they can't do shit.
If you have a chronic disease, you're fucked. Lupus? Fucked. Psoriasis? Fucked. MS? Fucked. There's not a single cure for any disease that's not bacterial or fungal in origin. Not one. They can perform surgeries and save your life if you've been shot, but you need antibiotics.
As someone with a lot of experience with mainstream medicine, the laymen underestimate the ability of doctors. If your body starts fucking up, it's for life.
(We did eradicate the disease that killed more people in history than warfare and all other diseases combined, Smallpox) but that was through vaccination.