It only makes sense to you because you’re accustomed to it, not because it’s innately better at “gauging human comfort”. All of us who grew up using metric know how to gauge comfort with Celsius. None of us bother with decimal fractions of a degree because there isn’t a big enough difference between degrees to do so, so your argument about granularity falls apart pretty quick there. You lot don’t have trouble with miles despite kilometres being more granular do you?
It’s like talking to an American who keeps asserting they don’t have an accent. If they don’t get it immediately, they’re probably not going to.