1 point
Is there a difference between 19, 20, and 21 Celsius?
First off, nobody claimed that Celsius is based on human perception so humans not being able to differentiate between these is simply irrelevant to the argument.
Second, the bounds of 0 and 100 are based on the freezing temp of water which are specific, non-arbitrary temperatures.
I’m not arguing one system over the other, I just think the “human scale” argument has been made up just to have an argument.