You mean a computer can store much more data and crunch through it easier? There is nothing sad about that. That's pretty obvious really. Medical diagnosis is one of the key examples of AI from academia.
My condition is unknown by many oncologists. Forget about general practitioners. Individual conditions may be rare but there are enough of them that they impact a lot of people collectively.
Not everyone is House. Sometimes you have to know when to punt it to a specialist, or even a specialists specialist, or to Mayo.
A machine can serve as a handy specialist, or at least an automated way of having the patient diagnose themselves.