[devereaux]

There is absolutely no technical reason why it should be the case if done properly.

With SIM cards or other hardware devices, your private key is never leaked (if "done properly")

With cryptos like BTC, you can generate many keys from one source of entropy, and treat them as disposable.

I don't see why medical records couldn't be encrypted with a disposable key, given by a hardware device which stores the seed, and only linked to the matching public key.