I use °C and I feel the need to use the places after the decimal. Also, I feel nothing wrong about it.
Also, I use °F for body temperature measurement and need to use the places after the decimal and feel fine with it.
Also, when using °C for body temperature, I still require the same number of decimal places as I require for °F.
I am not saying that °F is not useful, but I am invalidating your argument.