Re: So a dilemma.
"It's only a few oddball cases, including severe allergic reactions, that make the news where the information is relevant and for those a physical bracelet, card or pendant is much easier and harder to abuse."
It's those oddballs that are the ones that give rise to malpractice suits, especially for those with UNDETECTED or UNREPORTED allergies or reactions. Plus, as noted, emergency rooms are BOTH prone to hacking AND in need of very quick turnaround (each for the same reasons). So again, you need BOTH fast AND right.