Can you feel a difference of 1 degree Fahrenheit? Does it change your behavior? Do you need an extra sweater because it is 57 degrees inside instead of 58? As someone who has grown up with it, I would argue that the Fahrenheit system is too granular.
In general, if I ask someone what the temperature is, it will be estimated as "low 70s" or "high 50s". Never have I met anyone who would feel the temperature and then declare that it is 72 degrees, as opposed to 71 or 73. This suggests that the granularity is greater than what people feel, and is unnecessary for day-to-day use.
I can hardly think of a situation where a centigrade is not granular enough. The example GP gives with the air conditioner is IMHO a huge stretch - a 1 deg Celsius difference is pretty negligible. Disclaimer: Fahrenheit is the most annoying and nonsensical of imperial measurement scales to me, so I am biased against it.
W.r.t the Celsius scale, a comment from Celsius' country of origin in response to:
> Nobody lives their life around freezing and boiling temperatures. I live my life around 50 to 90 degrees and if you live yours around 10 to 40, I don’t see the advantage.
The natural response is of course we live close to freezing! 0 °C is the temperature that differentiates frozen lakes from open lakes, snow from rain, slippery dangerous roads from regular.
In general, if I ask someone what the temperature is, it will be estimated as "low 70s" or "high 50s". Never have I met anyone who would feel the temperature and then declare that it is 72 degrees, as opposed to 71 or 73. This suggests that the granularity is greater than what people feel, and is unnecessary for day-to-day use.