Earlier quoted context omitted.
Part of the problem with respect to applying this to vaccinations is that vaccines have a low but non-zero chance of failure. If everyone gets vaccinated, and 1% fail (that's just an arbitrary number), it's no big deal because there isn't enough of a population to carry an outbreak. But if 1% of vaccinated patients are vulnerable, and 5% of people choose not to get vaccinated, then now there's a potential for outbrea…
I don't understand how this affects the system. If the vaccine fails and you need urgent care, you are covered because you did get vaccinated, right? What am I missing?
Not really a flaw in your system as much as just something interesting to think about.