0-100F is a base 10 scale that has inherent advantages. It's not just "what you're used to" any more than you get used to base 10 anything, including all of the metric system. (Which should be redesigned around base 12, but that's a whole different rant).
Beyond that, I find that 1 degree Celsius is too wide of a measurement for a lot of things, especially in the kitchen. My sous vide steaks get cooked at 130F, and that tends to be +/- 1F with the accuracy of the sous vide. If I said it's at 54C +/- 1C, that's not quite right. 54C is closer to 129F, so it's almost outside the accuracy range already. Plus, that 1C of accuracy covers 2.2F, so the finish temperature could be anywhere from 126.8F to 132.2F. Way outside the range, the steak does come out different at those temperatures, and the lower end of that is potentially unsafe (though that's a complicated topic, as well).
But then if I say 54.4C +/- 0.45C, now I have to use more numbers (since numbers with zeros at the end, as in the F example, are easier to remember) with more decimal places to get to the same thing. Dropping down to milligrade or whatever is now using a prefix that's uncommon with this unit of measurement.
But then, I also want to use grams to measure everything out in the kitchen. Ounces and cups are crude for no real advantage.
Metric's ability to convert between units easily isn't particularly useful in the kitchen. Unless you're doing some molecular gastronomy shit, that is.
Purity is not a virtue. Being able to use different measurement systems in different contexts is an advantage.