Until you need insurance. Or a professional license that involves a review of your medical record. Or the government just wants the data. Or the records are subpoenaed to be used against you in court. You are trusting that illegitimate uses of this data will be punished. However, there are many authorized uses that will hurt you in the long term. It is rarely to your advantage to accumulate extensive recorded medical records.

Even pre-existing insurance denials could return in the US.

Don't let systems record what they don't need. They aren't your friend.