It doesn’t matter what other people think about the temperature, it only matters what you think. Fahrenheit is useful in the same sense the word Red is useful: you and I could be seeing totally different colors that we call red, but it doesn’t matter because we both point to the same objects as being red.

So because right now only Americans use fahrenheit, it must be bad? Holy logical fallacy batman

Something more specific than how humans relate to the temperature? Why would that be useful? If you’re doing science, you should use Celsius. If you’re a regular human being, being affected by temperature, you should use fahrenheit.

It’s based on how humans feel about heat, which was then translated into ammonium chloride so as not to be arbitrarily based on opinion. Without basing it on a chemical solution, it wouldnt be recreatable.

Do Americans feel heat differently or something?

Fahrenheit is roughly a 0-100 scale of “places humans can conceivably live”. 0-100 scales are more intuitive than a scale from like -15 to 40, which is approximately what celsius uses for the temperatures humans can live at.