Earlier quoted context omitted.
But you also have a significant risk to your life if your doctor can't get to them and orders the wrong treatment. The risk of that happening to you is actually significantly higher than dying from a lot of pretty common illnesses.
Unless I’m unconscious, I can give my doctor permission to access my medical history from where it’s kept under my control, and give them a quick run-down in the meantime if necessary. I feel that I should have a right to choose between the risk of death when both myself and my emergency contact are unable to provide medical information to a doctor, and the risk of my medical history becoming publicly available - or…
If they have to order your medical journal from a completely separate jurisdiction, in a completely different format, and then import it that would take longer. If you require specialist care which is not available in your area this is an issue that comes up again and again.
Not saying a centralized system would fix all the problems, or be perfect, but if it improves 1% of cases that's potentially thousands of people saved every year. That's a huge return for a very minor improvement.