The average person doesn’t live at sea level. More than half of all people have a boiling point of more than two degrees lower.
Most water that people who live near sea level live near is salt water.
If you’re willing to accept that level of imprecision, you may as well go with average human body temperature, since it’s literally our temperature.
Both fahrenheit and Celsius are defined by relatively arbitrary standards in relatively arbitrary ways. One decided water should freeze 100 degrees from boiling, the other 180. Should ice be 2 orders of magnitude from boiling, or half a circle?
Celsius should be preferred because it’s the standard. Some french people decided they liked powers of ten more that others, so here we are. Thanks Napoleon.
Neither system is adequate for the physically based goals of a modern unit system. Hence neither has any relationship to water anymore, instead being defined by actual physical invariants.



There’s a line, and I don’t know where it is. I’d very much rather someone go who didn’t need it than the other way, but medical care is to some extent a finite resource that can be over utilized.
Maybe the answer is to incentivise using it correctly instead of penalizing using it incorrectly. Get a check for showing up to or giving proper cancellation notice for all appointments, getting your regular checkups and stuff like that. Appropriate use of whatever we’re calling non-emergency walk in clinics. (At least where I am, your doctor has a lead time before appointments, and the emergency room is more geared towards immediate specialized care. The clinics are designed for “let’s give that sprained ankle a double check and pop a stich in that gouge”. Routine care that shouldn’t wait)