I never undertand the more granular, the scale is in 180 because that’s the most precision they could use to manufacture scientific thermometers, nowadays it’s completely irrelevant. Celsius thermometers have a granularity of 0.1°C and that is useful soley when you want to differentiate between “almost a slight fever” and “maybe a slight fever”. Do you find yourself needing to differentiate between 45 °F and 46 °F?