I just don't understand the utility over C. It sorta feeling like cold or hot doesn't make all that much sense to me, it's so vague

Exactly. Both C and F are arbitrary, both having some advantage over the other for certain circumstances. Kelvin is the only one you can argue for in a purely absolute sense. People saying C is better for some kind of purity reason are just making things up. C and F have the same basis in the measurement of reality, and they're just slightly better at measuring certain things than the other, but both are perfectly usable interchangeably.