90%+ chance the person you are replying to has health insurance that will cover them in case of medical disaster.
People who have poor money management skills believe that FIRE=Ramen and no health insurance... In fact, it's about getting a 30K car (the one I bought new 3 years ago) instead a 70K car despite having the money.
Even on a pretty good Kaiser plan, we're paying $200+ per day in the hospital, etc. On a high-deductible, more. They say they have a $1M annual limit, but that they've never enforced it. I hope we never have to find out.
If you have an extra couple million dollars above and beyond your regular retirement fund you could self-insure your medical costs. But then you could just buy the health insurance.