It's only that survivable if you have the option of hospital treatment. If you're the right kind of person, you have >>90% chance of not needing hospital treat

It's only that survivable if you have the option of hospital treatment. If you're the right kind of person, you have >>90% chance of not needing hospital treatment at all. But that still leaves a few per cent, and if you need hospital treatment and can't get it, your survivability is far from 99.99%. Which implies that the hospitals must have free resources (even after they take care of random things like eye operations instead of delaying treatment), which in turn restricts the number of people who can go unvaccinated. It's simple really.