If you start from a place of distrusting your medical professional, now you need a way of uniquely identifying them in a way that can tie back to them for accountability purposes. So we've introduced some kind of notarized identity service.
Furthermore, doctors are only going to read the most recent entry for any given data point: doctors won't read the entire file, especially in emergency situations.
Just because the status quo and doctor's behaviour is currently a certain way, doesn't mean it's the right way. The efficiency lacking in our health-"care" systems is astonishing - there needs to be self-regulation mechanisms and accountability.
Emergency situations is an orange if everything else is an apple, so of course there can be protocol and acceptable boundaries for each.
Humans are humans, mistakes can happen - especially that we aren't aware we're making, and therefore bound to make them again. Accountability will lead to necessary learning and improvement.
Furthermore, doctors are only going to read the most recent entry for any given data point: doctors won't read the entire file, especially in emergency situations.