> I don't really understand what the point of this is, to be honest [...] on a MyChart (Epic) profile
As someone who never heard of either MyChart nor Epic, I'm guessing it could be useful for people like me who don't have those things.
Epic is a electronic health record (EHR) software used by many hospitals and clinics. It's not the only EHR there are many but it's probably the most known. Doctors usually type patient notes, diagnoses, prescriptions... everything goes in Epic and your team of providers can gain access to see that info.
The software that runs on the backend of most healthcare facilities in the US.
I could understand epic since I think that's mainly for doctors but don't most hospital systems use MyChart or similar portals nowadays to let patients access access their appointments/payment/lab results/doctor notes/etc