Where I think they could be used is for in between temps. 1 degree centigrade covers a wide range when it comes to precision cooking like sous vide. Would be nice to drop to a smaller unit, but since metric can only work in multiples of ten, going down a level becomes overly precise.

The result is that I tend to prefer Farenheit for cooking, especially for sous vide. Unless you're doing molecular gastronomy shit, converting between units isn't that useful; you don't need to worry about how many Jules it's going to take to boil a given volume of water.

Conversely, grams are way nicer for measuring most things in the kitchen.